OPTICAL HEART RATE TRACKING Polar OH1 tracks your heart rate with Polar’s high-quality 6-LED optical heart rate solution.   HEART RATE SENSOR MODE You can use Polar OH1 to broadcast your heart rate to any Bluetooth-compatible Polar device, many fitness apps and Bluetooth-compatible gym equipment.   BUILT-IN MEMORY Polar OH1 has a built-in memory that can store up to 200 hours of training data. You can sync your data to Polar Flow with both the Polar Flow app and web service.   COMFORTABLE TEXTILE ARMBAND The Polar OH1 armband fits snugly, comfortably and discreetly around your arm. The band is made of a soft textile material and is machine-washable.   UPDATABLE FIRMWARE Polar OH1 keeps on improving with over-the-air updates.   LONG BATTERY LIFE With Polar OH1 you get up to 12 hours of training time on a single charge. You can charge the battery easily with the Polar OH1 USB adapter (included).   WATERPROOF Polar OH1 is waterproof up to 30 m.