Mio shows off new Mio Velo and Mio Fuse optical heart rate units

This week at Outdoor Retailer, Mio has quietly unveiled two new units based on their Mio Link product.  The first unit, the Mio Fuse, adds in both a display as well as a 24×7 activity monitoring.  While the second unit, the Mio Velo, caters to the bike crowd and contains an ANT+ to Bluetooth Smart bridge – enabling one to get ANT+ accessories onto Bluetooth Smart capable apps and watches/head units.

Both products are based on the smaller form factor Mio Link optical heart rate unit that Mio unveiled earlier this year at CES in January.  This means that both products contain an optical sensor to measure your heart rate, while each product has a separate set of non-overlapping functionality and features beyond that of Link.  Let’s dive right into them.

Mio Fuse:


The Mio Fuse is Mio’s first daily activity monitor that combines the same Mio Link optical HR functions while also adding in activity tracking with metrics like steps, distance and calories using a newly added accelerometer.  Further, as you can see above – it contains a display (which the Mio Link does not).  The sensor under the band looks very similar to that of the Mio Link, though there have been some minor tweaks to improve upon some of the lessons they’ve learned from Link that aim to increase performance (new Link units have also incorporated those tweaks after beta testing from a bunch of users, mostly DCR readers).


The Mio Fuse’s two components are split into the activity tracking piece, and then the workout tracking piece.  In daily activity tracking mode it’ll track your steps, calories, and distance.  This is similar to most Fitbit and related products. This information is then displayed on the display when touched:



You can tap the little button to the right of the screen to change the data shown on the screen:



All of this data is then uploaded to your smartphone app (planned for both iOS and Android, though iOS will launch slightly ahead of Android).  The unit will store about 2 weeks of daily activity tracking data before you need to sync with your phone.

You can also configure daily goals – targeting steps, calories or distance.  This is then shown on a progress bar on the unit:


They’re looking at establishing partnerships with some of the major online tracking sites in order to ensure you can get that data to your preferred site.

As for sleep tracking with the optical sensor they can go ahead and periodically enable it and start tracking resting heart rate while you’re asleep – so that’s something they’re looking at adding via firmware update after launch.

Note that in daily activity tracking mode the unit doesn’t enable the optical sensor, otherwise it would burn though battery too quickly.

Next, you’ve got the workout mode.  In this mode (primarily for running), it’ll enable the optical sensor for heart rate tracking.


Additionally, it’ll leverage the accelerometer to estimate distance and pace.  It also has a simple timer so you know how long you’re working out for.  This data is then saved automatically so it can be later uploaded to the Mio App.  From there the app can upload it to 3rd party sites like MapMyFitness and Strava.


The unit will store about 30 hours of workout data before it needs to be sync’d/uploaded to the app (recorded at 1-second rate).

Note that the Mio Fuse does not contain the bridge functionality I describe next in the Mio Velo section – though Mio says they’re open to adding it if there’s demand for that functionality.  Personally I think that it makes for a really interesting scenario for cyclists that want an activity tracker – since it ticks off numerous major boxes while giving them flexibility on newer cycling head units and sensors.

The Mio Fuse will be available around the holidays for approximately $179 (exact price isn’t 100% finalized).

Mio Velo:


Next up we’ve got the Mio Velo.  This unit effectively takes a Mio Link and adds in ANT+ bridge capability.  The bridge relays existing ANT+ devices and re-transmits then over Bluetooth Smart.  This is ideal for cyclists who want to use newer Bluetooth only devices that also only support Bluetooth Smart sensors.

For example, the new Polar V800 (watch) and Polar V650 (bike computer), as well as the Suunto Ambit3.  All three of these don’t accept ANT+ sensors, leaving users with existing ANT+ devices in a bit of a pickle.  By adding in a bridge however, it’ll rebroadcast those over Bluetooth Smart, effectively making your ANT+ Speed & Cadence sensor now a dual ANT+/Bluetooth Smart Speed & Cadence sensor.

This is very similar to what 4iiii’s did with their Viiiiva heart rate strap previously.  The core difference being that the Mio Velo is measuring optically on your wrist, whereas the Viiiiva is measuring more traditionally on your chest.  Though, due to the optical battery drain, the Mio Velo gets about 8 hours before recharging whereas the Viiiiva gets many months before requiring a new coin cell battery.

The Mio Velo will re-transmit both ANT+ speed and cadence sensor types, while concurrently also broadcasting your heart rate (measured optically on your wrist) to both ANT+ and Bluetooth Smart capable devices.  At launch they are not rebroadcasting power meter data, but are planning to add it in a firmware update shortly after release.

The unit will store/remember 4 sets of ANT+ sensors (so if you have different bikes you can pre-configure them), which are setup using a Mio app that will be available on your smartphone.  A set is comprised of speed and/or cadence sensors and then later a meter.

The Velo will be available around the holidays for a price of $129US.

With that, thanks for reading and as usual if there are any questions feel free to drop them below and I’ll try and round-up some answers.


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  1. Allyn Crowe

    Thanks Ray! Any idea on if the Fuse will maintain the dual Ant and BLE HR broadcasting? I use a link now for my HR to my Bia and Phone for track and compare. Adding in the activity tracking would be interesting.

  2. Steve Taylor

    I’m wondering what it’s going wearing the fuse 24 hours a day as tight as you need to get the optical to work. Okay you might slacken it off for non-workout use but are we supposed to tighten it up for sleep? I’ve only had experience of optical so far with the smart run and it gets pretty uncomfortable even on a shirt workout, especially in the heat. I still prefer a chest strap.

    • The optical sensor is only enabled for workout mode.

    • Steve Taylor

      I gathered that. Have they managed to develop a smooth sensor side of the device or does it dig into your flesh and leave a nice sensor shaped mark on your wrist like the Smartrun? Due to having narrow, boney wrists I have to have the thing pretty tight for it to work.

    • Well that’s a poor decision imho. I heard Basis watch ceo saying that they are aware that their watch lacks precise HR reading during workouts, but it monitors the HR the whole day.

      Mio could have come up with an algorithm which turns the sensor on every 5 minutes or something like that, and for workouts their sensor works great.

    • riz

      IMO they need to offer all days HR and would hope they copy something from Epson (or MyBasis) as seen quoted from DCR’s Epson Pulsense previews “Epson is a tiny bit different than those other company’s optical sensors. First, it’s built by Epson (not licensed from anyone). And second, it has a much longer battery life at 40hrs of optical-on (albeit transmitting every 5-seconds).”

  3. morey000

    So- would the Fuse measure and record HR during non-run times? such as during sleep, rest, walking, to perhaps fuse HR into activity/calorie estimation ?

    Also- do you happen to know what changes were made from the Link? (it appears that the LED circular area is pushed out a bit, for better skin contact). Any changes to the ANT+/BT antenna design, for instance?

    I’m a happy Link owner. Anyone want to buy a half used can of Static Guard?

    • Not normally no, just during activity mode.

    • this would seem like a sensible request however my understanding is that your burn rate at NON-running levels won’t change that much. This is backed up by my own personal analyses of my TRAINNGLOAD using TRIMPs – basically when you are walking or sleeping or sitting down you score ZERO.

  4. J Jones

    As an early adopter of the Link, one statement I saw ticked me off.
    “new Link units have also incorporated those tweaks after beta testing”
    Can you elaborate on this? My Link was in one of the early shipments. While I like it, I do experience dropouts etc. Kind of sucks that because I bought early, I have to buy another link to get the improvements (that should have been in the initial product).

    • Mio was pretty open about asking for beta testers on that post, and many DCR readers took them up on it (those that had issues). Obviously, not everyone had issues.

      If you’re experiencing an issue with yours – then ring up Mio support. If not, then there isn’t much to benefit from.

    • J Jones

      Ahh, I must have missed that particular comment. Anyway, I did contact Mio and they have already responded. It appears that they will get me taken care of.

      Thanks for providing us with a great blog and data!

    • Gingerneil

      I’ve emailed support.
      My main issues are dropouts due to low signal, low readings causing me to power cycle mid run, and latency of changes. Without details of the fixes, it’s hard to know if any of those have been addressed, and if they are hardware or software changes. I’ll await their reply.

    • Isaiah

      I’m also curious what those tweaks are and whether they are available for early adopters of the original Link.

      Thanks DC

    • J Jones

      Mio support did replace my Link. After using it several times or a week or so it stopped charging and will not turn on. I know the charger connection can be wonky so I paid attention to that and cleaned the contacts.

      Not a good sign when the replacement breaks too.
      Have contacted support again (ticket# 137767) so we will see. The new Velo model is interesting but not unless they can work the kinks out of the Link.

      How can I tell if my replacement Link has the improvements you mentioned?

  5. Ted W

    Any early views on potential battery life? I presume for the running/workout mode, that there might be a display off mode, and thus get a bit more battery life? How long does it take to charge the sibling Mio to say 50% or 75%? Some USB charging is quick, some not. My Galaxy Note 3, while it has a monsterous battery, can get close to 100% charge in under 1 hour. I’m thinking in terms of Fenix2 + Fuse in a 100+ trail run. Fenix2 can charge on the fly, while in use. Fuse would have to be removed I am sure.

  6. jonathan

    I was hoping Mio would come out with a new strap for the Link and the Velo. A strap that is versatile so that I could choose where to put it such as the forearm or above the bicep. I think that it would help compete with other optical HR sensors.

  7. Terry

    Well unfortunately for Mio they have left a bad taste in just a few folks mouth with the Link. Based on some incorrect info I purchased the Link to only find I can’t get it to sync to my Windows Phone 8 even though some say they have been successful in doing so. So basically what I have ended up with is a band with LED’s that tell me what range my HR falls within. Mio’s response was they don’t support Window’s Phone 8 devices period. I have resorted to a Zephyr chest strap which works well although I was hoping to get away from a chest strap….the Mio Link goes unused. The Fuse looks like a nice idea but after my experience with the Link I won’t be purchasing or recommending any of the Mio products. If anyone is interested in a virtually brand new Mio Link let me know.

    • On Windows Phone, give the Adidas app a try now. I got word from them on July 17th that they put a change in to reduce issues there. They (Adidas) said though that there may be one more bug you might run into that could cause drops that they’re trying to track down.

      To be fair to Mio, it’s not entirely their fault in this area – since there’s just virtually no Windows Phone apps out there that support BLE HR straps. Just like a year ago the same was true of Android.

    • Terry

      Not sure what Adidas fixed in miCoach but it didn’t change anything. I even uninstalled miCoach and reinstalled it. Just like before the Link shows up in the gear list but it won’t connect to it.

    • Hi Terry,

      Don’t worry, your LINK will most likely be supported by your WP8 as soon as you have updated it to WP 8.1 Release/Nokia Cyan. Windows Phone 8.0 does not support Bluetooth Smart but the Cyan update enables Bluetooth Smart for all Nokia phones.

      Once you’ve received your update you may want to try out our app Track Runner (www.trackrunnerapp.com). We are working with Mio and are in the process of verifying both LINK and ALPHA for use with our app but already have accounts of several users that got both sensors to work with Track Runner (they’re on WP 8.1). Our app is the best rated running app on Windows Phone and one of only few with Bluetooth Smart integration.

      Please feel free to contact me if you have any further questions.

  8. Gingerneil

    I hope they will provide a low cost offer for early link adaptors who are seeing issues with signal strength etc…. A bit of a kick in the teeth for us if not.

  9. Myria

    I take it there’s not going to be a fix for the original Link?

    • If you’re having issues with your unit, then ring up Mio support (which is what others have done). I suspect they can work something out from there.

    • Myria

      To be honest I wasn’t aware anyone wasn’t having issues with the original units.

      I was holding out some hope for the long rumored firmware update — the ‘fix’ I meant. Doesn’t sound like there is going to be one though.

  10. Tim

    I was so pumped for the LINK when it launched… then had, what felt like, major accuracy problems.

    I joined the beta when started and have seen better luck with the beta unit, although I still see periods of very wrong data once in awhile — enough that without a separate strap I often question the data.

    I’m now bummed the technology (or the LINK design) is not as solid of a performer for my personal needs.

    That being said I still keep coming back to try it again. Using the LINK has made me even more aware of how much I dislike the old straps.

    Any word on what’s up with the TICKR X? Any mention of it seems to have vanished! I didn’t care so much about the universal motion sensing or vibration, but wanted the TICKR RUN + memory. At a minimum I hoped I could load the dynamics later, but in addition to that recording a treadmill workout for loading later also seemed like a usable feature.

    Good reviews, always a pleasure to stop by!

  11. Thanks again Ray – great stuff. I’m getting excited for a quality tracker (mostly to track sleep and waking heart rate) with an ANT+ HRM (no more searching for a strap before working out). Looks like between these products they have just what I’m looking for, but actually aren’t selling what I want.

    As you say, I’m probably in the 1% but a ‘serious’ activity tracker with heart rate functionality that you can get into your existing devices (via ANT+) would be great. Am I missing one that would ‘work’ for me?

    All pretty cool stuff. Looks like you’re having fun.

  12. Colin

    With the new products have a way to tell battery life left? My only complaint with the link is it will run out of battery mid workout and before the workout there is no way to see how much life is left.

    To the bony wrist poster. Try putting it higher in the arm. I have to put it in the same arm as my 910 so it is on the meat of my arm.

  13. Henry

    As always, nice report. How about the water proofing rating of the devices? If the Fuse have some swimming specific features then it will be a killer against the others.

  14. Jerrod

    As a cardiac pacemaker patient, I’m incredibly excited for this new generation of optical HRM sensors to come out and for the category to mature. I have a Polar H7 that *mostly* works for me, but I have some occasional dropouts and odd readings that I expect are due to electronic interference with my pacemaker’s own signal.

    An optical HRM would work no different on me than anyone else, though. I’d love to log data from one of each (Rainmaker-style) and confirm my suspicions about the H7.

    This Mio Fuse in particular sounds very appealing to me.

    • the H7 I understand to have medical level accuracy. The MIO link supposedly has EKG accuaracy – I would imagine the H7 is more accurate.

    • Nick

      Im in the same boat, pacemaker with implanted defibrillator, thus chest straps are basically useless for me. I’ve been using the Mio alpha for a year now and it’s been fantastic! Accurate from what I can see, waterproof (as I regularly use it on mud / obstacle runs) and lasts.

      I’m hoping this one works as well as the Alpha, with the added feature of being able to read it in the dark.

  15. Nik

    The viiiva as far as I go,is useless to do any linkage. The apps just don’t support it making it essentially useless

  16. Richard Kaufmann

    I had an Alpha, and it worked pretty well (subjective 8/10 score)… The Link: 4/10 because of very frequent dropouts. I have to admit to being a “bad customer” and not calling up to complain. Instead I bought the Scosche Rhythm+ and I’m completely in love with it. Literally put it on and forget about it… It just freakin’ works!

    I will call the Mio folks to see if they can help. But the Valencell technology (used by the Rhythm+) is amazing, and the placement options (above my elbow hidden under my sleeve) are really a nice plus.

    • Everydayfella

      I’d like to see Mio use Valencell’s tech as well. Valencell’s stuff would make the Mio devices much more accurate & robust – plus it would make it more comfortable since the optics do not need to grip onto the skin like with the Mio. Valencell licenses their tech, so I would expect Mio could get access to it.

      But I do like the direction Mio is going in. There’s definitely a need for an activity tracker with accurate heart rate.

  17. Peter

    Hi, and thank you for this information. Does the new and improved strap also fit the original MIO LINK optical transmitter?
    Can I buy only the new strap and use my original transmitter bought earlier this year?


  18. Asaf

    I didn’t contact Mio support since as far as I understand, nothing is broken, that’s how the Mio link designed to work: decreased Ant+ signal for a better battery life.
    Thing is, the signal is so weak that you have to use the strap on the same hand as the watch (BT works perfect on both hands) to prevent dropouts.
    This was an unknown when I chose the strap and I find it (as many others) quite uncomfortable to say the least.
    But it has a solution! and an easy one:
    1, New firmware (not only increasing Ant+ signal but also fixing the delay between real HR and output)
    2. New Strap that allows you to place the Link on you upper arm

    I hope one of Mio members can address this issue in public and outline a course of action, which is needed, given the strap was advertised as designed for runners as well as cyclists.

    • Gingerneil

      I thought the output power was in line with ant+ standards, but the issue is with a poor hardware antenna design. This can’t be fixed in software.

    • Asaf

      If that is the case, then no firmware can change the low ant+ signal. Does it qualifiy as a reason to address Mio support? Another solution (and an easy one) would be to use 2 straps (if Mio would sell extension straps) that will allow to place the strap on your upper arm.

    • There was a hardware change put in place that’s already in place for recent Mio Link’s being produced. It does not however fully address the ANT+ signal strength, for which is working with ANT+ (Dynastream) on. They’ve told me they believe however that Bluetooth Smart connectivity should be very strong currently.

      Again though, if you’re seeing specific issues with your unit, I’d really recommend calling up support and seeing what they can do. As noted in a few comments by others who have contacted support already – they seem pretty flexible.

    • Gingerneil

      I’m in touch with them on email and they’ve asked to be sent a photo if the rear so they can check the batch number and hardware version. I’ve also sent them hr charts showing the low readings and disconnects. They’ve suggested I may be accepted into the beta programme, but it will depend on my particular issues and the unit. I’m 99% happy, but it’s a pain having to regularly check the link to make sure it behaving.

  19. Sal

    “Available around the holidays”…
    Sorry, as non-american / non-english: when is this (month)?

    I love my Link and wear a Fitbit One too. The Fuse could replace both of them.

  20. David Wong


    I have a silly question.

    I have a Garmin 910XT (yes, a pretty old GPS watch but I love it!) and I wonder if Mio Velo is able to combine my running data (distance, pace, actual GPS) with my HR data captured in Mio Velo with some apps, say Wahoo Fitness?

    • Not exactly. You could pair your FR910XT to the Mio Velo to get heart rate (that’s what I’d suggest), but there isn’t any method for the Mio Velo to pull from your FR910XT (the other data there).

      Sites like Training Peaks do however allow you to overlay multiple files together. So as long as you stopped/started your two devices at the same time, then you could simply upload both to a site like TP and then look at them in a combined manner.

    • David Wong

      Thanks! Got it. :) Really appreciate your prompt response.

  21. Karl

    Maybe a simple question, but does it show the time? As in always on?

  22. H M

    If it needs an App to pair ANT+ sensors – is this app iPhone or Android or both ??

    • You can pair via either ANT+ or Bluetooth Smart – it sends both concurrently. Thus for most it makes more sense to use Bluetooth Smart on the iPhone (with an app of your choice), and on Android you can use ANT+ or Bluetooth Smart depending on your phone.

    • Gingerneil

      I think he is asking if the configuration app is Android or iPhone? Dcr will confirm, but they have both apps for the Link, so I would expect both ios and Android the new devices.

    • Mio will have both apps for Android and iOS. They’ll have the iOS app slightly ahead of Android, or, more specifically, the iOS app might have more advanced functionality slightly ahead of Android. They’re still working out those details.

  23. Any thoughts about the MIO Link Pro [Pro] anyone?

  24. Can the Fuse do a delayed upload to anything other than the APP? eg can I go swimming (in run mode) and then finish and have it upload to my 910XT or V800?

  25. EB

    I wonder if the MIO Velo will be restricted to bike sensors. I am wondering as the Wahoo RFLKT+ converts ANT+ stride sensors. On a number of occasions I have gone to the gym with it for treadmill runs. Not really designed to be on the wrist though. Works well enough.

    I don’t have any of these devices but I guess it would be helpful if it bridged BP monitors, scales and exercise machines. I can also see file transfer being useful, but think that less likely (eg. 910XT sending file to Velo, which sends it to a phone for uploading to Garmin Connect without the need for an ANT+ dongle).

    I don’t know where the BTLE developer specifications are so haven’t read them and don’t know how plausible it would be.

  26. Havelaar

    Very interesting, Ray!

    Thank’s for the heads-up!

    “As for sleep tracking with the optical sensor they can go ahead and periodically enable it and start tracking resting heart rate while you’re asleep – so that’s something they’re looking at adding via firmware update after launch.” That’s the most interesting function of the Fuse, I think.

    One basic thing I did not understand: can you use the Fuse as ant+ heart rate sensor with other android apps than the mio one on a smartphone with ant+ functionality?

    And than some other points:
    – weight?
    – waterproofing?
    – swimming? (will it be possible to store heart rate and accelerometer readings from swimming in the internal memory?)
    – charging? (over the micro-usb cable and charger of the smartphone or do you need to bring another cable/charger with you?)

    In general, do you think that there is a realistic chance to increase the battery life of optical heart rate sensors in the near future? It is really a newly introduced issue that we did not have with coin cell chest straps.

    • The weight of Fuse is 35g. The weight of Velo is 29g. Note that things might change a tiny bit between now and final production.

      The unit is waterproof and can be swum with (per Mio), whether or not the readings will be accurate in water remains to be seen. Most have found it successful on the Link while swimming next to another watch (I have, as well as others).

      Charging is via a small dock that connects to USB, not micro-USB. This is for waterproofing reasons.

      As for optical sensor battery increases, I have no doubt we’ll see increases their. For example, 4iiii’s and their pods have a much longer battery life, though, said pods haven’t yet been released.

  27. Matt

    Really interested in the mio fuse. I just bought the link on a whim and so far it has worked without hiccups. My question is more toward the step information. On the link, it needs to be actively connected to a program to get and record the data. Where does the step information go? Is it only there for your own personal display, or does it upload periodically? Also can the steps be time-linked? Such as during these hours, you did more walking than during these hours. I don’t need a 24hr HRM. Just one that I can toggle on and off when needed or to be on during insanity and rugby workouts.

    • The Fuse had storage capacity, whereas the Link does not. Meaning, it has additional/different hardware.

      The steps would show up in the app against a given timeframe, though I haven’t seen the app yet.

  28. Karl

    Ok need some advice here.

    My wife deosn’t like running, however she is very into circuit training including some sprints on treadmill etc.

    She also doesn’t like big watches or wearing heart rate straps.

    So i was thinking something like an optical wrist strap would be best so she can mainly see heart rate and caloroes burnt.

    Would the MIO Fuse suit?

    It says there is a workput mode, but will this assume you are running and therefore underestimate calories being burnt? or can you tell it you are in the gym and to ignore the accelerometer?

    Looked at the tomtom cardio (i have the multisport) but it still does not have a generic indoor mode for gym sessions.

    Any advice would be great,

  29. Karl

    Great. Looks like the fuse is the option.

  30. Martin

    So Fenix2 equals no heart rate under water. Ambit3 equals no support for ANT+. Making me head bumping into the wall. This option with the wristbased converter turns the table around a bit. Already an owner of Edge 800 I can see Suunto as an exciting pick. If I only could afford both.

    Btw. Wouldn’t it be nice if you have to expand the comments to see them? Cause you’re reviews is quite something to read and with over a thousand comments it feels like some Russian author did. No progress at all reading. And then it’s mostly just comments anyway. Will probably not see anyone making this much effort on a review. I think there’s answers for everyone.

    • Morey000

      The Ambit 2 (ANT+) now has added support for receiving HR in swim mode.. provided you have an HR monitor that can ‘reach’ the watch through the water- such as a Mio mounted right next to the watch. Obviously, it’s not going to work with a standard HR strap. I believe that this is the 1st watch to allow this.

    • As for expansion of comments, I am looking at doing something around expansion of an FAQ section of sorts. It’s on the list…

  31. @MOREY – Polar could do it YEARS ago (HR underwater). ANT+ will only travel a tiny amount through water ie not from the chest …… UNLESS it is stored in that chest strap and later uploaded. In fact Suunto are using Garmin technology to do this (Dynastream). Bizarre but I believe true.

    • There’s a key difference that Morey is pointing out: Suunto has just enabled this on the mode that captures swim metrics. This is something that neither Garmin nor Polar (or anyone else) can do today.

      Myself and a few others have tested and confirmed that a Mio Link next to either a Garmin or Suunto device does capture HR underwater. The challenge has been that in that mode you couldn’t previously also enable swim metrics capturing (i.e. swim distance/storke/etc…).

      Suunto enabled this due to the Ambit3. I had seen it on the Movescount Dev side a few months back, but wasn’t clear if they’d “allow” it for non Ambit-3 models. Hopefully it sticks beyond the next few weeks (given it’s in prod now, it probably will).

    • Martin

      Lovely confirmation. Thanks!

      And I won’t start swiming until next spring. Can’t swim indoors cause my asthma makes me really sensitive to nitrogen trichloride/trichloramine. Bronchitis two weeks is not fun. Not going to be a polar bear though (if you seen Seinfeld season three).

    • Martin

      I would like to update my question.

      Mio Link under wet suit and Fenix2 above. Will that work with heart rate transmition?

      Any reason to wait for a Mio Fuse?

  32. probably yes if the unit is next to the fenix2 and used in run mode. you might lose transmission. you wouldn’t get any swim metrics

    the fuse will save all the data it records to upload later. any poor contact with your skin and parts of data will be lost. Fuse will record separately so you wouldn’t need to link it to your fenix2 at all.

    • Yup, I’d agree it would likely work if directly next to each other, but like 5K says, there’s a chance of loss.

      The one challenge you may have with putting the Fuse (or Link) below the wetsuit is that the button could get depressed, thus potentially turning it off (or off and on, or some combo thereof). I haven’t tried it myself, but knowing that the Link button can be a bit finicky to random pressures (just like the Scosche), it could be something that pops up.

    • Martin

      I want swim metrics and heart rate data from Mio Fuse. Don’t want to choose either. Like at least to be able to merge the data on Garmin Connect or similiar service. Not two seperate files.

      Could it be possible with a custom workout?

      Of course a tight wetsuit can cause trouble but there’s always a way to solve a problem.

      But I’m not going to start swiming yet so no rush for Mio Fuse. Really like the feature with resting heart rate. I expect alot to happen in the product segment over the next few years.

    • Unfortunately, that’s simply not possible on Garmin devices today. The HR profile just isn’t something you can enable/activate within the swim metrics mode. A custom workout doesn’t enable the sensor support.

      Suunto just enabled it on their units primarily in prep for the Ambit3 (I don’t expect Garmin to follow-suit anytime soon).

  33. you can merge two data tracks for sure on sporttracks. I’ve done it.

    I’ve put in a request to garmin to allow the hr to be turned on for swim in the next firmware release of the 910xt…but ahem, I also have a candle that is blowing in the wind :-) A request from Ray might have a slightly better than zero chance (ie my chance is zero, no offence intended to Ray)

  34. Neil

    I bought a Link mainly due to Ray’s review of his (test) unit, I really wish I’d waited until some production units had made their way into the wild though as mine is in the Draw Of Disgrace now.

    What happens is that the HR displayed on the head unit starts dropping – so during a threshold effort your HR drifts down from ~175 to ~85, despite a constant power output.

    Once power-cycled the Link goes back to showing the correct HR value.


    I stopped using it and went back to my old HR strap.

    • Gingerneil

      I had similar dropouts. I emailed support, and they have replaced it with an updated version. The hardware has been slightly revised to make the sensor stick out a little further. This pushed it into the skin a little more and results in a far better reading.

    • I’d agree, I’d your having issues, simply ring up support and they’ll swap out the unit.

  35. jb82

    Does the fuse transmit hr data to say garmin watches like the link does?

    Is there any benefit for a recreational runner to buy the velo over the link? Or is (as the name suggests) this just the bike version of the link?

    • Yes, both Fuse and Velo both transmit to a Garmin. I don’t see a reason for runner to get Velo over Fuse.

    • jb82

      Okay thanks!
      So the Fuse is basically an upgraded link. I was worried it was just a standalone thing or only would work with ios or something. I had some issues with the link a while back so maybe i’ll just try out the fuse.

  36. Armando


    Will the MIO Fuse be able to substitute the Foot pod?? and send info while running to Ant+ devices??

    Thanks for the info, great review.

  37. Sue

    I’m trying to decide whether to wait for the new Mio Velo or just buy the Mio Link. my question is- Is the Velo only for cyclists?? can it be used for other activites (running) if I pair if off with my Garmin Forerunner or the New PolarM400? I have a Garmin Forerunner 305 and looking to finally upgrade and the PolarM400 is a good replacement since it also tracks activity and sleep. (I read your review of it here and glad to say you convinced me) I just hate chest strap HRM…i always forget to wear. Mio Fuse is ok but I run a lot and need to see pace, distance etc..hence my going with the Polar M400.

  38. Jeremey Godfrey

    Has anyone managed to get the mio link connected to iphone 6 and apple health app. I have tried a number of options using third party apps but without paying for the heart rate sensor option of these apps have yet been unable to find a successful solution.


  39. Brandon

    So has anyone heard a more solid release date? I am torn between the Basis Peak and the Fuse. Any suggestions as which may be the better choice?

  40. Zak

    Hi Ray, great info but one detail missing. I do a lot of stairs climbing, does it have altimeter or (whatever number) axis sensor to count stairs and then use that to more accurately calculate calories burnt? Cheers!

  41. Armando

    Hi Ray,

    Just looking for other interesting uses for the Velo, I don’t want to buy the wahoo key for the ipad. Do you know or can you suggest MIO to ad the capability to sync Ant+ devices (FR910xt or any other) through Bluetooth smart.

    Thanks Ray

  42. Mirko

    Hi Ray,

    with the Fuse’s availability hopefully getting close, I was considering buying one mostly for use during cross-training at the gym. Do you think I can wear it a bit higher on my forearm (à la Scosche Rhythm)? Right on the wrist it’d be damaged by kettlebells, plus it might limit my wrist mobility during olympic lifts with barbells.

    Getting the Scosche would force me to have my mobile around to check the HR, which is also not an option …

    Thanks a lot, bye

    • If you can fit it around your arm/etc, yup, no problems. It’ll pretty much work anywhere on your body you can affix it. I’ve even put it under my swimcap for some simple tests (against forehead).

  43. Dustin Denti

    Hi Ray,
    I’m sure you answered this but I want to use one of these for triathlons. I’ll just send the heart rate to both my Garmin. 510 and my Garmin 310 watch. Which one would you recommend for this?

  44. David Manley

    Really intrigued by this one. An all day activity tracker than can also act as the HR monitor when I put my garmin on. Could be just what I’m after

  45. Jon

    Any update on when the Mio Fuse will be released? The holiday season is upon us and the only site that lists the Fuse for sale is REI, and it says it’s on backorder.

    By the way, I’m new to this site — it has the best fitness watch reviews out there. Thanks for all the help.

    • Sue

      Just saw on their website it will be available for shipping December 8th. You can pre-order now.

    • Jon

      Thanks! Hadn’t seen that. Now I really have to make a final decision on this.

    • Jon

      I ordered from REI on Friday, and I got it in the mail yesterday. I feel so cool having it two weeks before the official release date!

      The Android app isn’t updated yet so you can only see your steps, calories, distance, etc on the Fuse. But the HRM links to Endomondo just fine. I walked to work this morning just to check it out and it seems to work perfectly. I may go to the gym for a quick run on the treadmill to see how it works.

  46. Laura


    Quoting from your review: “The Mio Link’s two components are split into the activity tracking piece, and then the workout tracking piece.”

    Did you mean to write “Fuse” instead of “Link”? Not trying to pick nits, I’m just dangerously close to pre-ordering a Fuse for HIIT training, and am festering in minutia.


  47. Laura

    Thank you for your quick reply, and for resisting the urge to virtually slap me. One final question(s): is the Fuse really all it says? Will this truly give me accurate HR data without the dreaded strap, or am I succumbing to hype and unexamined consumption pressures?
    Thanks again

    • From a HR standpoint, yes, it’s fairly well proven. Additionally, they redesigned the antenna in the Fuse, so any of the previous Link ANT+ transmission issues should be gone. I’ll get my test units tomorrow I believe, though I met with the Mio folks today in person to discuss the items.

      The piece that’s slightly more unknown/new is the app component in terms of getting step data, etc…

    • Jon

      I got mine on Monday (REI is already shipping them). I used it at the gym yesterday on a bike and an elliptical and check the HRM against the one on the machines and the Fuse was spot on. I also wore it for a 2 mile walk, using Endomondo to track, and the data looks pretty consistent and accurate. I haven’t gone for a run outside with it yet as my right knee is still sore from my long run on Saturday and I don’t want to injure it more. I may go out for a run tomorrow.

      The app (on Android at least), is very bare bones right now. You can’t upload your steps or calories yet, but that will be coming. One weird thing I’ve noticed is that the steps, calories, and distance on the band are not resetting each night, they have just accumulated since I turned it on on Monday. I email support this morning. Maybe this is something that gets fixed when they release the final app.

    • Matt

      Damn, I tried REI and they’re already sold out!

  48. Laura

    That’s very helpful Jon, thank you. My credit card is giving a resigned sigh.

  49. Surasak

    Hi Ray,

    Checking with its manual and Mio facebook, I just wonder that the Fuse has no sleep tracking function. Will they update firmware to add this function as you mention. It’s ridiculous that activity tracker doesn’t have sleep tracker, compare to the market.

  50. ghawk

    Is there a simple watch function? getting ready to order one.

  51. Mike

    Have you received a Mio Fuse yet, for testing?

    • Nope, but I got a note just a few minutes after your post that there was a shipping SNAFU and they re-shipped it yesterday. Should be here in the morning (according to FedEx tracking number). It cleared customs already so once it passes that I usually have it by lunch.

    • Mike

      Excellent, please keep me informed! It is down to this or the Fitbit Surge for me.

    • Yup. We know how the optical sensor is on the Fuse, as it’s identical to Link. And, with Fuse, the larger footprint meant they were able to tweak the ANT+ pieces a bit for better transmission.

      The real question (in my mind) is the app side of it and the ecosystem. For an activity tracker, I consider that a core/fundamental piece.

    • Mike

      What is the latest you think you’ll have the review up for this? Tuesday or Wednesday?

    • The final production unit just arrived this evening (and I’m wearing it already). It’s unlikely I’ll have a review in 2-3 days. Usually I like a few weeks. Though, since I have a fair bit of history with the product, I can slim that down a bit typically. On the other hand, it also has a fair bit of history in the Mio Link era with transmission oddities that I want to ensure are resolved.

    • Mike

      Understood. I just thought you already have background on it and could compare to the Scosche pretty quickly…

      Their app for Android still isn’t ready. Talked to them today. They were saying some time next week.

      Take your time. I want to be sure you got a good bead on it.

    • Yeah, it’s the app piece I haven’t had access to. Which, from an activity tracker component is the major item.

  52. Bart Bouse

    Any more on the possibility of opening up bridge functionality on the Fuse similar to the Velo? For cycling, that would be really great. With that, why would anyone need or want the Velo? Am I missing something there? If you could view your heart rate on the Fuse and other metrics on you gps watch (especially if you only have three data lines ala Fenix), it really makes for a nice combination if you don’t have a 310xt, 910xt, or 920.

  53. Jessica

    Garmin new speed and cadence sensors
    Mio velo
    Garmin vivofit
    iPhone 4s

    Want to get speed and cadence to show up on iPhone for indoor trainer. Best app to go about doing this?

    Also when it’s nice outside again (and not cold and snowy) and it’s time to race again (tri’s) best bike computer/multi sport watch to use for the bike data.

    Thanks. I’m newer to the biking world.

    • In theory the Velo will route the Garmin sensors and re-broadcast them as BLE sensors. I haven’t yet tried the speed-only/cadence-only ones I don’t believe. From there, you could/should be able to use the Wahoo Fitness app (free) to record.

  54. Matt

    Hi Ray,

    I would love to use the Fuse via Ant+ with my Garmin Edge 500 on the bike. However, it seems like you need to do an initial setup with either a fairly recent IOS or Android device. The only one of these I have is an Ipad 2, which is not supported. My question is: can I just use it out of the box to transmit HR data to the Garmin without setup? I don’t need all the fitness, etc. capabilities – I’m only interested in it as a HR transmitter.

    Thanks! I, like so many others, really appreciate the dedication and effort you put into to researching all this stuff!

  55. raychu

    Hi Ray,
    got my hands on the new Mio Velo, fail at pairing my garmin speed sensor to it on iphone 6 but works on iphone 5s, but vector doesnt work on both (already upgraded to firmware2.4).

    Do you have a velo in hand to confirm the iphone 6 bug and the lack of power meter support?


  56. Ruy

    Do the mio fuse, velo, and link work with the Suunto Ambit3? I want to use the mio for swimming with it. Ambit 3 is only bluetooth smart. I read the velo and fuse work great with polar v800 (which like ambit3 is only Bluetooth smart) but I read somewhere there were configurations issues specifically with the Ambit 3.

  57. Thomas Dunbar

    I like the Fuse as it meets the functionality I’m looking for, but I would like to wear it as a watch. Currently in ‘all day’ mode, the display will not stay on. Thus you have to push a button to display time (steps…etc.). Any word if they plan on changing this? If so, would currently models be updated with a software patch? Thanks!

  58. Jeff M

    Ray – quick question about this battery life on the Fuse. You mentioned that it’s not set up to do continuous heart rate monitoring in daily activity mode, as that would drain the battery too quickly. My question is: what’s battery life with the CHR running in exercise mode? Also, any perspective on the Fuse’s battery life given the FitBit Surge / Charge HR focus on continuous HR tracking? Thanks in advance!

  59. Mike

    Anxiously awaiting the full report on the Mio Fuse. Hoping it’s done before the cutoff for ordering ahead of Christmas. If the Mio Fuse isn’t the all-in-one device it’s billed to be, I will be getting the Scosche Rhythm+ and a Vivofit or Fitbit One…

    Either way, $150 is my spending range. No need for a GPS watch, but definitely need an all day tracker and a workout tracker.

    • Mike

      It seems Mio just pushed an in-app update to Mio GO for Android users. I don’t have a device so I can’t confirm what gets captured/displayed now. Maybe someone else can?

    • I’m aiming for review release later this week. So far, mostly so good.

    • Naveed Ramadan

      ive been testing it against my fenix 2 + heart rate strap and so far I’m finding the mio fuse heart rate data is delayed to report spikes during interval training and doesn’t track the high ranges. I.e during a 30 second spring my heart rate will hit 160-170 and my fenix shows this, whereas the mio fuse shows 90-110 then jumps to 130-140 by the time my heart rate drops to 150 according to the fenix.

  60. amy

    My Mio Fuse resets itself at noon instead of midnight. Any idea how to fix this?

  61. naveed

    ive been testing it against my fenix 2 + heart rate strap and so far I’m finding the mio fuse heart rate data is delayed to report spikes during interval training and doesn’t track the high ranges. I.e during a 30 second spring my heart rate will hit 160-170 and my fenix shows this, whereas the mio fuse shows 90-110 then jumps to 130-140 by the time my heart rate drops to 150 according to the fenix. I’ve tried a number of different placements on my arm to no benefit.

  62. Raychu

    Bought the Mio Velo the first day it came out coz i’ve been looking forward to try using the iphone as my main computer. no luck getting it to translate the ant+ signals from my garmin sensors to iphone 6, partially work on iphone 5s (i guess vector isnt supported for now, despite they are showing a picture of them in mio’s official webpage)
    Ok so I guess i’ll just use it as an oversized mio link fo now, however, Heart rate signal is unstable, spike or drop every 2-3km on running (yes i am wearing it on the same wrist as my 920xt), and even worse on the bike. emailed their cs and asked about the iphone 6 issue and future power meter support, zero reply for 2 weeks. overall very disappointed with this piece of expensive gear that does not work as advertised.

  63. JohnC

    Hi Ray,
    Have you tested syncing the Fuse with the Ambit3 in the water? Same question as Ruy (#130), which I think you may have missed,

    I love your very detailed reviews! Just bought an Ambit3 based strongly on the info you provided, and I’m very happy with it so far (no doubts, just that I haven’t mastered it yet…).

    Now I’d like to add an HR sensor for open water swimming, and I don’t like straps so unfortunately Suunto’s sensor won’t work for me. I do like the sound of the Fuse, but can’t find any confirmation on connectivity with the Ambit3.


    • JohnC

      Sorry, ignore my question above. Just realised you’ve published a detailed review of the Fuse, so I’ve posted the same question there…

  64. Shaka

    Hi Ray,

    Would like to verify. For a cyclist, the Mio Velo will send HR information to either/both ANT+ and BLE cycling computers. Is the HR data, acquired via the Velo, be then downloaded from the cycling computer (Polar, Garmin) to non Mio apps?

    Many thanks. S

  65. Shaka

    ..put differently. Is combining the Mio Velo with Polar cycling computer like substituting a heart strap with an optical sensor? Thanks. Shak

  66. Lex

    Hi Ray,

    A question: you mentioned at the beginning of your post (just under the 1st photo) that “The sensor under the band looks very similar to that of the Mio Link, though there have been some minor tweaks to improve upon some of the lessons they’ve learned from Link that aim to increase performance.”

    Would you by any chance know how to tell the difference on the sensor in LINK models? How one can check whether he purchased the old model of the LINK? And, whether the yellow Electric special version of the LINK is with new sensor?


    • gingerneil

      I had one if the first Links, and Mio then swapped it for a changed model. The first ones were flush flat on the back. The change was to make the sensor protrude a little so it pushed more into your flesh and allowed the led to avoid interference with the ambient light. In my experience, it was a very positive change.

  67. Ivan

    Hi Ray,

    When do you expect to publish your Mio Velo review?
    I’m in the market for an optical HR sensor that broadcast simultaniously to ANT+ devices such as Garmin FR/Edge AND bluetooth devices such as a smartphone.

    Seen the extra bridging functionality the Mio Velo offers may sooner or later come in handy, it has my preference.

    I however learned to await your findings before deciding upon a purchase.

    Thanks in advance for your input.


  68. rob

    Hello, so having read a lot of these reviews, is it safe to say that “accurate workout HR information is simply not available via optical HR sensors?” in other words, “HR strap or GTFO” if you want accurate workout data?

    • No, I wouldn’t say that’s accurate at all.

      I think in general, the Mio and Scosche products are very accurate – but that beyond that it gets a bit messy. For example, the Fitbit Surge isn’t as accurate, but is better than the Samsung products.

      In the case of Mio, their challenge wasn’t really the optical sensor – but rather the transmission piece was a bit inconsistent on one of their products.

  69. Bill Smith

    Hi I play squash and want a heart rate monitor. However I don’t want to have my phone on me or bluetooth enabled whilst playing. Can I just store the heart rate on the Mio and then upload to my phone app (iPhone) via bluetooth once back home from the squash club?

  70. Sophi

    Hi. I have a vivo smart and am looking to buy an HRM. I am primarily looking between Mio Link, Mio Velo, and Scoshe products. I would like advice on which may be best for me. I am primarily a runner but I want to track my heart rate during swimming. I got the vivosmart because it was waterproof so I could use it during swimming. I am considering triathlon-ing and think that maybe the Velo would be a better investment should I start cycling more often.

    The Mio and Scoshe appeal to me because it is a non chest strap and the Ambit3 is out of my price range.

  71. JB


    Any news on a full review of the Velo? And is it compatible with IOS/Iphone6 and trainerroad?


  72. Marco

    Hi, would the Velo fit well a 15.5 cm wrist or would it be too big? By looking at the specs it seems this would be towards the minimum of their sizing.

    Would the Velo also cahce and sync the HR or does it only measure and transmit?

  73. RC


    I wonder if Mio Velo is compatible with Wahoo Blue SC Cycling Speed & Cadence Sensor? Possibly link them together to Wahoo Fitness App, and other popular Apps such as Cyclemeter, Strava, MapMyRide and Runtastic Mountain Bike. I just got my Wahoo Blue SC so I’m looking for a reliable HR wrist monitor that can work together with it.

    Thanks for your very informative blog.

    • No, the Velo only pulls in ANT+ sensors. But there’s really no reason to use the BlueSC with the Velo, since the BlueSC is already Bluetooth Smart – so you can connect it directly to all of the apps you just mentioned.

      (Minor addendum: If you got the BlueSCv2 which is dual ANT+/BLE, then you could technically route the ANT+ side through Velo, but that seems sorta duplicate in nature).

  74. RC

    Yes, I got the dual ANT+/BLE. It seems Mio Link is all I need to get a decent HR wrist monitor. Amazon is listing it at $64.99. It’s way cheaper than Mio Velo listed at $122.41. For Velo price, I might as well get Mio Fuse for additional $23. I think it’s worth it with the extra features/functions Mio Fuse can provide.

    Thanks for the quick response.

    • Matthew

      What I find best so far in combination is the link(or other hrm) in conjunction with the tom tom multi sport. I have never tried it with the Wahoo sensor…but I think it can handle multiple connections at once. The benefit here is it all flows into the tom tom and you just upload that data to your phone or computer after the fact. Less moving parts and less battery waste on your phone.


    Can anybody tell me if Mio Velo has memory?


    Another question for Mio Fuse:
    If i use outsoursing app (such as Endomondo ) data are memorised in the device and then can be downloaded in the app or it has to be connected all the time to drain data?

  77. Stroga

    I’ve seen issues with some apps (eg traineroad) not working with ant+ to Bluetooth bridges like the Mio Velo and the 4iiii Viiiiva. Something to do with certain apps not accepting multiple sensor feeds from one device possibly. Do you have any experience of this?

    I’d be wanting to use one to transmit my HR and feeds from my existing Garmin Speen and Cadence sensor to my iPad over Bluetooth for use with the Traineroad app


    • Indeed, it’s a messy realm when using converters. I wish there was a good option there, but alas, the different apps have various ‘agreements’ that make life difficult for consumers.

      For example, TR basically ignores the Viiiiva and Velo hardware, which is more widely used. That was mostly an artifact of Wahoo promising they’d come out with their own (they never did), which TR was fairly closely aligned with.

    • stroga

      Thanks for such a quick and detailed response. It took about 10 days to get the same answer from manufacturers which it took you 10 hours, including the time difference between US and the UK!

      I was guessing this would be the case as every app seems to recommend and only work with the Wahoo ant+ 30 pin dongle. Unfortunately this also means it is very hard to fine a cheap one of these :(

      Real shame as the bridges seem like a really good idea for people who have multiple devices but then I suppose really companies want to tie you into their ecosystem

  78. Martine Duperre

    I am one of those that the Garmin chest strap never worked and is declaring me dead! I am a cyclist and I use the Garmin for maps, cadence and all the stuff EXCEPT heart rate monitoring. That I do with a Polar Watch. So I get too many devices on my bike (guidon). I am looking for a solution. Do you think this Mio velo could be best for someone that the Garmin chest strap never worked? I undestand that the Mio velo can be paired with a Garmin 510. If not, wath would you recommend about the new stuff.

    Than you very much for your answer, I’ve been looking for a solution for two or more years now.

    • morey

      the Mio Velo/link broadcasts both ANT+ and Bluetooth. So, it can be paired with nearly any watch, cycling computer or phone. If the chest straps are driving you nuts- then an optical strap is a good option. Either this or the Scosche. They’re not perfect- as with a cold arm, sometimes mine picks up my running cadence, and they don’t do HRV (heart rate variability) which some watches use for recovery assessment. But they’re a great choice. Make the $80 investment.

    • Martine

      Thanks Morey. If I can ask one more question. Are these devices kind on “electronic devices challenged persons?”. I mean, I’m not very good with electronics ;-)

    • morey

      hmmm. the Mio has one button on it. it’s either ON or OFF. My guess is that you can handle it. :) the only finicky part is finding the right location. Moving it up and down your arm and rotating it a little, so that it finds a good piece of skin where it can see capillaries or whatever it looks at.

    • Martine

      Thanks again. I suppose I’m able to turn the on/off button and twist until it fits.