Fangrui Product Details 1. Z21 Plus 0.96 Inch Tft Lcd Color Screen Smart Bracelet Ip68 Waterproof, Support Call Reminder Heart Rate Monitoring Sleep Monitoring Multiple Sport Mode 2. About Product 3. App Os: Android 4.4 And Above, Ios 8.0 Or Higher 4. Material: Upper Case: Pc, Wristband: Tpe 5. Bluetooth: Ble4.2 6. Type Of Battery: Lithium Polymer Battery 7. Battery Capacity: 100mah 8. Charging Time: 1-2 Hours 9. Working Time: 15 Days 10. Charging Method: Usb Port Direct Charge 11. Features 12. Heart Rate Detection; 24h Continuous Heart Rate; Time And Date Display, Step Counting, Calories, Distance With Screen Display; Sleep Monitoring (sleep Time, Sleep Quality); Call Reminder, Sms, Qq, Wechat And Other Third-party Application Message Content Push (to Save 8 Message Records); Wechat Motion Access; Sedentary Reminder; Alarm Reminder; Find Mobile Phone; Multiple Sports Modes (running, Cycling, Swimming, Badminton, Table Tennis, Tennis, Skipping); Call Rejection; Remote Control Camera; Do Not Disturb Mode; Brightness Adjustment; Bright Time Adjustment;stopwatch