About Product1. Bluetooth version: BLE 4.02. Battery capacity: 90mAh3. Waterproof rating: IP654. System: Android system 5.0 version or above,iOS system 9.0 version or above5. Screen resolution: 240*2406. Working time:About 1 week7. Standby time:About 2 weeksFunction1. Heart rate monitoring,blood pressure monitoring,blood oxygen monitoring2. Standard sport function (step, distance, calories)3. Sleep monitoring (sleep time, sleep qualityﾣﾩ4. Call reminder,message reminder,sedentary reminder,5. Smart alarm clock,find your phone,raise hand to lighten screen