?Heart Rate & Sleep Monitoring?: Tracks real-time heart rate automatically & continuously and automatically tracks your sleep duration & consistency with comprehensive analysis of sleep quality data, helping you adjust yourself for a healthier lifestyle ?Battery Durable?It is suitable for iOS/Android smart phones with Bluetooth version 4.0 or later, and it is very easy to operate according to the user guide guidelines. The charging time is 2-3 hours, the working time is 5-7 days, and the standby time is 8-10 days. ?Abundant Functions?Time and date display,, step calories display, real-time or regular heart rate monitoring, blood pressure real-time monitoring, text message content view, stopwatch function, settings function, call reminder, sedentary reminder, remote camera shoot, anti-lost alert, sports goals finished reminder, simply It's your life's omnipotent steward. ?Waterproof and Sweat-proof?The waterproof and sweat-proof function can be used in daily washing, bathing, raining, swimming?running and outdoor activities without damaging the smart bracelet. And it can be used 10 meters underwater. (Note: The smart bracelet cannot be used in hot water) ?USB Charging?: Built-in USB plug makes it easy to charge with any USB block and computer; no charging cable and dock needed;