The DKN Bluetooth heart rate sensor lets you track your heart rate very accurately and it is Bluetooth 4.0 compatible. The sensor works with some great fitness and training applications and weighs only 130g (4.6oz). This accessory offers a battery that lasts up to 1000 hours and it is waterproof (IX7 standard) so you can use it in wet conditions.
Provides accurate heart rate information to compatible mobile training applications
Bluetooth 4.0 compatible
Integrates with fitness tracker Apps including Strava, Wahoo, Runtastic, Runkeeper, Endomondo, etc.