Main Features: 100% new and high quality Answer calls and play music Operation mode: touch operation Turn on: long press the function key Charging voltage 5V current 1A-2.1A charging time 2 hours Approximate standby time 7-15 days All-day activity tracking: step counting, smart reminder, health monitoring, information push, tracking / alarm, exercise tracking, sleep analysis Smart reminder: call reminder, SMS push, sedentary reminder More features: phone search, remote camera shooting, stopwatch Continuous heart rate monitor: continuous heart rate tracking on your wrist every second 0.96 inch TFT color touch screen: HD screen, easy to read all fitness data Customizable clock face Bluetooth 4.0, compatible with Android 5.0 and above systems, iOS 9.0 and above systems