Photo 1 of ** VERY USED** Polar H10 Heart Rate Monitor Chest Strap - ANT + Bluetooth, Waterproof HR Sensor for Men and Women, Gray, M-XXL

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Photo 1 of ** VERY USED** Polar H10 Heart Rate Monitor Chest Strap - ANT + Bluetooth, Waterproof HR Sensor for Men and Women, Gray, M-XXLPhoto 2 of ** VERY USED** Polar H10 Heart Rate Monitor Chest Strap - ANT + Bluetooth, Waterproof HR Sensor for Men and Women, Gray, M-XXL