Z21 Plus 0.96 inch TFT LCD Color Screen Smart Bracelet IP68 Waterproof, Support Call Reminder Heart Rate Monitoring Sleep Monitoring Multiple Sport Mode About Product 1. APP OS: Android 4.4 and above, iOS 8.0 or higher 2. Material: Upper case: PC, wristband: TPE 3. Bluetooth: BLE4.2 4. Type of battery: Lithium polymer battery 5. Battery capacity: 100mAh 6. Charging time: 1-2 hours 7. Working time: 15 days 8. Charging method: USB port direct charge Features 1. 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