WS18 MAX ULTRA 2.03 inch Color ScreenAbout Product 1. Battery capacity: 320mAh 2. Bluetooth version :Bluetooth 3.0/5. 03. Charging method:Wiress charging 4. Waterproof rating: IP68 waterproof 5. System: Android system 5.0 version or above,iOS system 9.0 version or above 6. Resolution :320x 3907. Standby time:7-15 Days 8. Charging time:2-3 Hours 9. APP Name: RDFit 10. Watch Support languages:Chinese, English (default), Russian, Spanish, Portuguese, Turkish, Hebrew, Arabic, Vietnamese, Persian 11. APP Support languages: Chinese, English (default), Russian, Spanish, Portuguese, Turkish, Hebrew, Arabic, Vietnamese, PersianFunction 1. Heart rate monitoring,blood pressure monitoring,blood oxygen monitoring 2. Step,distance,calorie 3. Sleep monitoring (sleep duration, sleep ) 4. Code, find mobile phone, calendar, track,alipay, camera, information, restart 5. Body temperature, women's health, weather, voice istant, my QR code 6. Menu, timer,comp (calibrated as prompted),altitude,stopwatch, music, alarm clock 7. Brightness lev, vibration intensity, time and date setting, pword lock, 180 movement modes