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.

The best optical sensor (I tried them all). Extremely accurate around the bicep and even the wrist (not usually advised due to inaccuracy). Easy to charge, usb-c, and the auto on/off works beautifully. The strap is too uncomfy and pinchy, but is easily swapped for a replacement Coospo Hw9 strap which is the best (feed it through in one loop and trim the bits). Like all opticals, readings lag a few seconds behind realtime, and it takes a few seconds to dial in after putting on.

Brilliant product. Having had a Polar H10 for years and gone through god knows how many chest straps I decided to try this as I'd heard good reviews about arm straps. It's not missed a beat since getting it...excuse the pun! It's also less restrictive than something around your chest and a lot more accurate than the wrist based HR.

Love mine. Use it on every run. It does its job so well you’ll forget you’ve got it on. It’s so much more accurate than even a high end running watch and much more comfortable than a chest strap. Connects v easily and battery life is amazing.

Very easy to setup and use with my Garmin watch, much quicker and more comfortable to use than my Garmin HRM pro HR strap. I am using the Coros much more than my Garmin HRM pro HR strap. I hope the accuracy is the same as my Garmin

Significant upgrade vs wrist hr. A lot more comfortable than chest strap.

I did an 8 x 400m interval session in sub zero weather and it record 7 out of 8 with a small error on 1.

Super easy to set up on a Garmin watch.

Very happy with this heart rate monitor. Fits well, is accurate and connects easily with my garmin watch. Would recommend

Bought as a gift for my husband and he absolutely loves it!

Brilliant quality, comfortable to wear and easy to set up. Highly recommended by a very serious runner!

Se connecte rapidement.

On l'oublie au porté contrairement à une ceinture

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.

Muy buen medidor de frecuencia, siento más confianza que con el reloj.

Le dura mucho la pila y es muy cómodo

Original product. Works as expected. Better HR tracking compared to wist based heart monitor. Got this to get better accuracy as far as training load is concerned. Amazing battery life and connects easily with a COROS watch via the app.