C21pro 1.39 inch Color Screen Smart Watch,Support Heart Rate Blood Pressure Blood Oxygen Monitoring About Product 1. Battery capacity: 410mAh 2. Bluetooth version :BLE 5.2 3. Charging method:magnetic charging 4. Waterproof rating: depth waterproof 5. Resolution:360x360 6. System: Android system 6.0 version or above,iOS system 9.0 version or above 7. APP:FitcloudPro 8. APP support languages: Danish, Ukrainian, Russian, Croatian, Hungarian, Hindi, Indonesian, Türkiye, Hebrew, Greek, German fried Italian, Czech, Slovak, Japanese, French, Lanzhou, Thai, Swedish, Simplified Chinese, Traditional Chinese, Finnish, English, Dutch, Portuguese, Spanish, Vietnamese, Albanian, Arabic, Korean 9. Watch support languages:Chinese, English (default), German, Korean, Spanish, Japanese, French, Russian, Arabic, Ukrainian, Italian, Portuguese, Romanian, Polish, Turkish in total 15 types Function 1. Heart rate monitoring,blood pressure monitoring,blood oxygen monitoring 2. Step,distance,calorie 3. Sleep monitoring (sleep duration, sleep quality) 4. Weather, WeChat sports, information reminders (messages, drinking water, sedentary, alarm clock),Women's Health cycle,,stopwatch, countdown 5. Find the phone, find watch, camera control, dial switching, music control,Settings 6. Password lock, breathing training, sports, sports history, do not disturb mode, power saving mode, low power reminder, voice assistant (SIRI) 7. Call function, favorite contacts, phone dial, split screen function, scan code connection, calculator, calendar 8. Message and Call Alerts:Phone, SMS, WeChat、QQ、Facebook、Twitter、Instagram、Skype、WhatsAPP etc. 9. Multi-sport modes: Walking, running, mountaineering, cycling, basketball, swimming, badminton, and football etc.