The Polar H10 sensor is placed on the body.

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The Polar H10 is compatible with the following Polar heart rate sensors: A300, A360, CS100, CS200, CS300, CS400, F6, F1, FS2c, FS3c, FT1, FT2, FT4,

Polar H10 Heart Rate Monitor HRM Sensor with Pro Soft Chest Strap Bluetooth ANT+