Heart Rate Monitor, Comfort, Easy to wear, Auto-wear Detection, Advanced Sensor, Precise Data, Bluetooth, 38 Hours Battery Life, Connects up to 3 Devices at Once

I was a part of a voluntary COROS HRM device testing program for two months ahead of the public release for this device, and was so impressed with the metrics it provided that I felt it valuable enough to buy as a gift for a fellow athlete. This quick review reflects my experience with the device during testing (and afterwards), and is not sponsored by COROS. About me: I’ve been an avid runner since 2012, trending towards longer endurance-based events. I’ve run a number of ultramarathons and a handful of 100 mile races. I also do a bit of road and indoor (stationary trainer) cycling as cross-training. Things I like: This HRM appeals to me because of its simplicity and versatility. I like that there are no buttons (it senses when it is being worn), and I like the fact that once you set the sizing, it stays put and is easy to slip on before an activity. For sizing: I’m 5’-9”, 160-ish, and I still have plenty of slack in the strap…but I don’t do a lot of lifting. It is SO much simpler and WAY less noticeable than a chest strap. I also love the magnetic charger–even though it is relatively short (and proprietary). Charging is quick, and the battery life is ample, so it won’t be charging for very long anyhow. Data accuracy: During testing I compared this new HRM to my Wahoo TICKR HRM, as well as data from wrist-based optical HR sensors (COROS Pace 3 and Apex 2 Pro watches). The short summary is that the most consistent data came from this COROS armband. The KICKR chest strap–while plenty accurate–was slower getting an initial reading before beginning an activity, and had some data drop-outs during the activity as well. Chest straps occasionally require adjusting during activities as they loosen and slip. Wrist-based HRM sensors work fairly well, but are somewhat activity dependent. Cycling (especially if venturing off-road) can jostle these sensors from wrist contact and can result in some inconsistent data too. The armband stays securely in place, and is so comfortable and light I often don't notice I'm wearing it. During testing there were data anomalies from all devices, but the armband HRM produced FAR FEWER than any of the others. Material thoughts: The armband material has held up well so far, but DOES tend to get stinky and discolored with wear. I’ve had mine since early July, and wash it with soap and water occasionally when I can’t stand the funk, and it cleans up nicely (see photos). Replacement armbands are also available, though I can't see needing one for a good while. Something I wrote to the product testing group during evaluation: “The more I run with both an arm and chest strap the more I LOVE the arm band. I’ve now got a rash from the chest strap and it drops signal more than any of the three HR options. I’ll admit that I’m a sucker for simplicity, so would normally just use readout from the watch (decent)…but if I need an accurate and responsive HR readout, I’m picking the HR31.” Summary: This armband doesn’t miss a beat (ha!) and makes a lot of sense for an athlete interested in reliable HRM data across multiple sports. I initially wasn’t too keen on adding another device to my quiver, but this HRM earned its place, and would be a worthy asset to those who value consistent accurate data across disciplines.

OMG. I didn't even know I needed this until I was told about it and tried it out! While I've used chest straps for years, I have put up with the chafing, itchiness, and general uncomfortableness of them (multiple brands). NO MORE! After using the Coros HR Monitor Arm Strap I will NEVER go back to chest straps again! When worn on the bicep it is hardly noticeable. Barely even know its there when worn! It linked up fast and easily to my Coros watch! Discovered I can even link it to my Strava account thru phone's bluetooth for heart rate monitoring! I use Android, but it paired to my daughter's iphone also when she asked to use it! Linked up to my bluetooth exercise bike at the gym too! When used for my runs and gym, the readings adjust instantaneously to my heart rate changes with no delay and more importantly accurately! This will be a game changer come this winter since the monitor will be closer to my heart and respond more quickly in the cold temps! Stated battery life is 38 hours, so perfect for thos LONG ultras! Gonna wear for my 50k in three weeks! One of the best things is it turns on and off automatically when worn or not, no more power buttons YAY! The strap is easily removed to wash and the unit itself is waterproof, so no issues with rain! As it is brand new item, there haven't been many updates yet, but Coros always improves and updates as needed from my experience. This has been probably the best $79 I've spent during my running years. Gonna suggest to all my friends to get one!

I bought this to replace a Polar H10 chest strap that was starting to fail after a few years. I use it for cycling and have only used it twice so far but it has been flawless with no spikes or dropouts. It seems accurate and agrees with my Apple Watch which I know agrees with my chest strap. It is more comfortable to wear than the chest strap and also don’t have to keep replacing the CR2032 batteries. I was a little skeptical because I had a few arm bands in the past that were terrible but this one is solid. I bought this instead of the polar Verity because it was less expensive and I did not need all the bells and whistles. It works perfectly with my Garmin Edge cycling computer.

This thing is ridiculous. The band itself is fine, it's comfortable and easy. BUT I cannot figure out how to find my heart rate. I can open Apple Health and see what it is at the moment, but it doesn't record ANY info. The only way to do it is upload a third party app, which I cannot figure out how any of them work. I've tried Strava but it's such an awful clunky app. And still cannot find my heart rate. I tried to connect it to the device and it acted like it did, but then there's still no info. So I figured out you have to pay for the subscription ($80/year!), I tried free trial and still cannot find my damn heart rate.

This is a nice heart rate monitor. I use it while riding a stationary bike. It is simple to use, comfortable, accurate, and reliable. The tricky part was finding a decent app to interface with it. The COROS app isn't all that useful during workouts. It will show your current heart rate and that's about it. In my opinion, the popular exercise apps like Strava and others ask for too much personal information upfront and are cluttered with too many functions that I don't need. Plus they tend to prod the user to sign up for a monthly subscription to "unlock premium features." The best app I've found is ZonePoints (Android). It works well with this COROS HRM and it shows a real-time graph of heart rate, color-coded for 5 different zones. It also saves each workout to history and stats for comparison.

I’ve tried a few heart rate monitors over the years, and this one from COROS is easily my favorite. The biggest win for me is comfort — being able to wear it on either my forearm or upper arm makes a huge difference. No more dealing with a tight, restrictive chest strap that gets uncomfortable, especially on longer workouts or rides. Accuracy has been spot on, and it connects quickly without any issues. I’ve used it for both cycling and gym sessions, and it’s been super consistent the whole time. It also stays in place really well, even when I’m sweating a lot or moving around. If you’ve ever been annoyed with chest straps, this is a no-brainer upgrade. Way more comfortable, just as reliable, and honestly something I don’t even notice I’m wearing anymore. Highly recommend.

Fantastic, works great, comfortable, only issue I have is that the buckle/metal fastener on it tends to rub my lats and arm, might be because I’m a more muscular build but just a small issue, no big deal. Typically if it starts to rub/get uncomfortable I switch it to my forearm and it works perfectly. I love that I can sync it to Apple health and use with my Apple Watch as well as my Coros watch. Battery life is great and haven’t had an issue with band smelling as long as I rinse it. Great HR device, is very accurate and much more comfortable than a chest strap.

Can't say enough good things about this arm band HR monitor. I have a top of the line Polar H10 chest strap and there's no comparison. I'll NEVER go back to the chest strap!!! The chest strap isn't comfortable and always feels like it slips down. It also randomly loses connectivity. The Coros HR armband is so comfortable you forget you're wearing it. It's also (most importantly) VERY accurate and doesn't lose connection. Another very important thing to consider is the fact that the optical HR on all watches doesn't work that well, especially for women who aren't vascular. The optical on the watches seems to have a hard time picking up the pigment changes from the wrist. This arm band has completely solved that problem! Another thing that shouldn't be overlooked is the simplicity and battery life. Simple because all you have to do is keep it charged and put it on. It's all automatic. Turns on and off by itself. And one charge will last about 30 hours. There are now four people in our running group who own the Coros and everyone loves it. Coros, you knocked it out of the park with this armband technology and you deserve credit for that. Thank you and keep up the good work. P.S. - Although I own the Apex 2 and love it, the best bang for the buck at this time (01/30/24) would be to combine the Pace 3 with this armband HR monitor.

Super leicht Sehr präzise Lange Akku-Laufzeit Merkt man kaum beim Tragen Sehr komfortables Armband Gamechanger für jeden ambitionierten Athleten 💪💪

Game changer. I've been using chest straps for the last 15 years. Never really any issues other than batteries dying. Gone through Garmins and then maybe 3 wahoo ones. All fine I guess, the Wahoo's only seem to last a couple of years for some reason. Now, pre-setting the strap for these has always been just one of those things I did, either under a tap and embrace the chill when you put it on, or the spit and rub which always had a mildly kinky vibe to it :) Not to mention the more often than not coffee scented strap after a while. Then I finally cave a get this little switcheroo. I wasn't sure how good it would be using the same kind of system that watch based heart rate sensors use (which always seem to lock on to cadence for me). But this thing is solid. Comfy, requires no spit and means i can add a new weird tan line to my arm come summer. But in seriousness, it's accurate, connects to my suunto watch, (i've not used the coros app), is accurate and i honestly forget I'm wearing it. Plus being that it sits on my upper arm and not at the core of my body, it doesn't get anywhere near as sweaty in the heat.

Bought in Jan, broke in Jun. No idea why. Cant find reasonable customer support

I am using it with my coros watch and it's perfect match

Excellent armband heart rate monitor. It connects flawlessly to my Peloton equipment with zero setup hassle. It’s comfortable to wear, and once you’re used to having an armband HRM, you barely notice it’s there. Heart rate tracking is very accurate—especially the rise and fall during workouts—noticeably better than what I get from watches, which is exactly why I purchased it. I don’t own any other COROS products, so this has been a standalone purchase for me, and it’s performed perfectly.