ROMANTIC BEAR Fitness Tracker Watch, Smart Band Step Tracker Calorie Counter Sleep Monitor Touch Screen Activity Health Tracker Wearable Pedometer Smart Bracelet for iPhone Android Smartphone (Black)

1. Compatible system: Bluetooth sync support Android 4.4 and above version and iOS 7.1 and above 2. Sensor G-sensor: kx022-1020 3. Bluetooth Chip Nordic NRF51822-QFAA 4. USB interface Charging time 1-1 5H 5. Battery capacity 45mAh life time 5-7 days