Polar H2 Hybrid W.I.N.D. Heart Rate Sensor
The slim Polar H2 heart rate sensor not only measures your heart rate but also seamlessly adapts to your body shape, so you can forget you are wearing it and focus on your exercise. The H2 uses both 5kHz and 2.4GHz W.I.N.D. transmission for maximum compatibility - works with any Polar model and Polar compatible gym equipment.