XOSS Optical Armband Heart Rate Monitor Bluetooth

“XOSS HR armband Provides live, accurate heart rate to compatible mobile training apps through Bluetooth & ANT+
IP67 Waterproof, suitable for daily use. Max heart rate detection and vibration feedback feature.

Chargeable lithium battery provides up to 20 hours Working Time
Designed to be wearable on your arm, soft strap provides ultimate comfort.

Support devices: Smart Watch, Bike computer, Smart phone,Fitness Equipment.”