COROS 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, for Run and Bike-Grey

Coros Dura is reliable, accurate, and easy to connect with. I've been using it for cycling and getting excellent results. I recommend Coros as it provides better outcomes with this device. The battery consumption is low, allowing you to trust it for up to 20 hours.

Excellent performance

My watch would often go into cadence lock and provide wrong HR data on easy to medium pace runs. This optical armband heart rate monitor from Coros seems to have resolved that issue. The heart rate data now coincides with the perceived effort. The band is pretty snug and comfortable and stays on the arm once strapped. It is an optical HR sensor with an inbuilt battery and, an advertised battery of 38 hours. The battery dropped by just 2% after a 3hr activity - battery life looks promising. Although it is basically just the same optical sensor on my Coros watch and does not come with any additional data or sensors. It would've been a nice addition if they'd included an HRV measurement or a thermometer.

This heart rate monitor is designed to be worn on the upper arm. It seamlessly synchronizes with the watch and has an automatic on feature. It is user-friendly and hassle-free.

This doesn’t even work don’t recommended

Buy this watch only if you already have a smart watch and want to improve HR accuracy. If you do not have a smart watch , then the coros HRM will connect with the app but : 1. coros app will not receive the HR data 2. you need to use third party apps like Strava to receive data 3. Even with third party apps, you will have to manually start recording an activity to record HR 4. no 24/7 recording of I wanted to get my father a continuous 24/7 HR monitor (he had fitbit charge 6 which died within a year) and did the mistake of buying this device as a replacement ( In my defense - as of october 2025 the product details and various youtube videos mention that coros HRM can be used without a watch but they do not mention the lack of functionality in that setup ) I have had a great experience with coros pace 3. however with coros HRM its just a wrong purchase The device itself is probably good ( will update review after few months ) .