Review on Maximize Your Performance with POLAR H9 Heart Rate Sensor by Mark Gardner

What's very good: the sensor paired with my Polar M430 watch straight away. When I wear the bracelet and exercise, the watch has no problem recognizing the sensor and getting accurate readings. The best thing is that the watch always slips down my arm when I exercise and that is no longer a problem. Only the belt ridiculously fastens around my torso with a simple hook that slides through a loop. Nothing protects him. So if I bend, like hip pivots, or touch my toes, the hook slips out and the band falls off. It doesn't matter whether the hook is pointing up or down. It's hard to believe the company tested this. I would gladly pay a euro more for a standard quick release. Maybe I can sew one myself.