customers all are our friends Smart Watch Introduction: Function: GPS route tracking,NFC pass control,Compass,ECG,100+ sports modes,Breathing training,dial push, stopwatch, brightness control, multi-sport mode, sleep monitor, heart rate, , information, remote music, weather, find phone (available after phone connected), bluetooth call, bluetooth music playback, password protection, calculator, split-screen display, shortcut widgets, weather, massager, QR code Compatible System:IOS / Android System Device supported languages: English, Chinese, Traditional Chinese, Danish, Greek, Latin, RoAdultian,, Hebrew, Czech, Polish, Spanish, GerAdult, , Portuguese, French, Japanese, Italian, Vietnamese, Korean , Arabic, Persian.Indonesian Screen size: 1.5-inch full-view color screen Screen Resolution:454*454 Life time:Normal use 4-5 days, standby 10-15 days. (Actual use time depends on personal use) Battery capacity:360mAh Charging method:Wireless charger Although the bracelet can monitor your heart rate, it cannot be used for any medical purpose,it is only to help people live a healthier life.All measureAdultts results are for reference only.They are based on seientific algorithms and sensors.So please dont compare them to medical devices,we appreciate your understanding.