Monitor Heart Rate Smart Bluetooth

Specifications:
Color: Black
Strap material: Silicone
Case material: Metal
Compatible system: Android4.3 or above, IOS7.0 or above
Bluetooth version: 4.0
Bluetooth distance: 10 meters (open area)
Applicable group: Adult
Battery: Rechargeable polymer 70mAh (included)
Charging time: About 30 minutes
Standby time: 10-15 days
Continuous heart rate monitor: 48h
Key mode: Touch
Main chip model: Nordic51822
Input voltage: DC 5v
Charging interface: USB2.0
Strap width: 1.6cm
Strap thickness: 0.3cm
Strap length: 24.2cm
Watch dial size: 4.6*2*1.1cm 
Waterproof rating: IP67
Features: Time display, heart rate monitor, pedometer, phone message reminder, sleep monitor, bracelet anti-lost, etc.