Review on Polar H10 Bluetooth Heart Rate Monitor, Compatible with iPhone & Android - Black Chest Strap HRM by Doyun Siu ᠌

I highly recommend, especially for training in the gym (circular and interval) for those for whom +\- 5 beats / minute matters. Its pros: Automatically connects to almost all machines in the gym. It shows the pulse very accurately and without delay. The difference with optical sensors in watches and even on the shoulder (H01 Polar) is immediately visible. Has cons: Constantly loses connection with the Garmin 945 watch, although the firmware on both devices is the latest. Moreover, it loses communication both via Bluetooth and ANT +. Until I figured out what's going on.