Recommended reason 24 hours PER sec sustained heart rate monitoring--UPGRADED fitness tracker can support 24 hours per second to monitor your heart rate, different from the past monitoring per hour; Monitoring your heart rate to help you do exercise scientifically and help you get a better understanding of your fitness level. Sleep monitor--Synchronize your sleep time every night and analyze your sleep quality by the sleep trend graphs; Accurately monitor total effective sleeping time and motions every night, you can better understand your sleeping quality. Multi functions --Pedometer, Calories, Distance, Heart Rate Monitor, Sleep quality measurement, Call reminder, Alarm clock, Search bracelet and so on, these amazing features are available, do not hesitate; App is more comprehensive, now it is updated version. Besides, it is with high quality comfortable and fashion strap. Wide compatibility & Long-lasting battery--Full charge requires only 2 hours and the standby time can be up to 5-7 days with full power. App supports most smart phones with Bluetooth 4.0 or above. Support system: iOS 8.4 or above, Android 4.4 or above Reminder many APP message, Wechte/QQ/Microblogging/facebook/twitter/whatsapp/line/kakaotalk (open you APP , click mine -click Device management-click intelligent reminder -click APP reminder -- setting what you want (Wecht /QQ/facebook/twitter/whatsapp etc)) Main Features: - Bluetooth Synchronization With Bluetooth 4.0, this smart bracelet is available for smartphones with Bluetooth function - Professional Heart Rate Detection Whether you are resting or doing sports, detect your heart rate accurately - Intelligent Anti-lost Watch will send an alarm after leaving the mobile phone in a certain distance, no need to worry about losing your phone - Remote Camera Control your smartphone to take photos, catching every moment you want - Sport Monitor This smart bracelet can record steps, calories and distance, so you can know your sports data, adjust your exercise program and live a healthier life - Sleep Monitor Accurately monitor total effective sleeping time and motion time every night, helping you develop good living habits - Sedentary Reminder Develop scientific habits and effectively resist sub-health - APP supports languages: English, Japanese, Simplified Chinese, Traditional Chinese, French, German, Russian, Romanian