1.39 inch Waterproof Smart Sports Wristband 1. Functions: Upgrade 8763E chip, one-key connection to Bluetooth calls, ectricity reminder push, SMS reminder push, WeChat reminder push, QQ reminder push, exercise record (step counting, mileage, etc.), sleep monitoring, sedentary reminder, calorie calculation, Stopwatch, raise hand to brighten the screen, dynamic heart rate, blood pressure, vibration, more than 100 sports modes, 10 sets of themes, remote camera, music control, smart alarm, weather forecast, multi-dial switching, WeChat sports, female menstrual cycle 2. Chip: Realtek8763EWE 3. Compatible system: App(Da Fit) Android4.4 or above, IOS9.0 or above 4. ROM: 640KB, RAM: 578KB, external storage flash: 128MB (not included) 5. Display:Type: Full screen touch IPS TFTSize: 1.39 inchesPixs: 360x 3606. Bluetooth connection: BT5.2, transmission range: about 20m 7. Gravity sensor: SC7A 208. Heart rate sensor: HRS 36009. Battery capacity: 360mAh 10. Charging method: Magnetic charging 11. Waterproof grade: IP 6712. Over the Air (FOTA): OTG 13. Bracet languages: Chinese, Traditional Chinese, English, German, Korean, Spanish, Japanese, French, Russian, Arabic, Ukrainian, Italian, Portuguese 14. App supports languages: English, Arabic, Danish, German, Spanish, Finnish, French, Italian, Japanese, Korean, Dutch, Norwegian, Polish, Portuguese, Russian, Swedish, Thai, Ukrainian, Chinese, Traditional Chinese, etc. 15. Size: 45.8x12mm 16. Strap material: Silicone strap 17. Bracet weight: 55g