6-LED optical heart rate, Bluetooth 4.0, Li-Po, 45mAh, 30m Water resistance
Polar OH1, Bluetooth, Black, 30 m, Android, iOS, Built-in, 9.5 mm
Polar OH1. Heart rate data transfer: Bluetooth, Product colour: Black, Waterproof up to: 30 m. Battery type: Built-in. Height: 9.5 mm