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H9 Heart Rate Sensor is a high quality heart rate sensor from Polar that is perfect for fitness and training. Polar H9 comes with the Polar Soft Strap for classic and reliable heart rate measurement. Polar H9 reacts instantly and measures your body’s response to exercise and provides accurate calorie burn. From gym to indoor cycling to jogging or group exercise Polar H9 tracks your heart rate together with your chosen app or device.