E21 1.69 inch Color Screen Smart Watch, IP68 Waterproof,Support Heart Rate MonitoringBlood Pressure MonitoringBlood Oxygen MonitoringSleep MonitoringFemale Physiology Reminder About Product 1. Battery capacity: 200mAh 2. Waterproof level: IP68 waterproof 3. Bluetooth version : Bluetooth 5.0 4. Resolution:240*280 5. Charging method:Magnetic charging 6. System: Android system 4.4 version or above,iOS system 8.0 version or above 7. Standby time:about 20-25 days 8. Usage time:about 7 days 9. APP:Tefiti 10. Watch support languages:Chinese, English, Korean, Japanese, German, Spanish, French, Italian, Portuguese, Arabic, Russian, Dutch, Indonesian, Hindi, Polish, Turkish 11. APP support languages: Android: English, Arabic, Czech, French, German, Indonesian, Italian, Japanese, Korean, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Thai, Traditional Chinese, Turkish, Romanian, Hindi iOSEnglish, Arabic, Czech, French, German, Indonesian, Italian, Japanese, Korean, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Traditional Chinese Function 1. Heart rate monitoring,blood pressure monitoring,blood oxygen monitoring 2. Step,distance,calorie 3. Sleep monitoring (sleep time, sleep quality) 4. Multi-sport modes:walking,running,cycling,skipping rope,badminton,basketball,football,swimming etc. 5. Social APP message reminder:QQ, WeChat, nailing, wang zhen, sina weibo, lnstagram, linkeln, Snapchat, bursts, Facebook, Skype, Twitter, WhatsApp, Line, KakaoTalk 6. Stopwatch,sedentary reminder, alarm clock reminder, drinking water reminder, shake photo, female physiology reminder 7. WeChat sports access, sports goal setting, fitness information sharing 8. Weather, raise hands and brightening screen, find mobile phone, call rejection, do not disturb mode