1.9 inches Large HD Color Touch Screen1.9 large color screen and full screen touch and hand sliding. It ensures smooth operations and 280*340 resolution for you. Our screen is better at color saturation and reproduction. Personalize your smart watch for men women with multiple customized watch faces provided, make your own stylish smart watch. Heart Rate, Sleep, Blood Activity TrackingWith our smartwatch, it accurately monitors your heart rate in real time.Also, it provides a detailed analysis of your sleep quality by continuously recording your sleep patterns. During exercise,smart watch automatically records daily steps, distance counter,calories burned, active minutes,measure your blood oxygen saturation and understand your physical state. 24/7 Real Time Heart Rate and Sleep MonitorSmart watch adopt the high-performance sensors monitor and use an intelligent algorithm to track 24 hours heart rate, paying attention to your physical health. Sleep monitor tracks your sleep stage data in deep sleep, light sleep, real sleep time through a comprehensive analysis of sleep quality data to help you grasp the health information better and achieve a healthier and self-discipline lifestyle. (Watches cannot be used for medical purposes.) Long-lasting Battery Life IP67 WaterproofThe large battery capacity (300mAh) and low power consumption design offers longer endurance. It could last about 10 days when in auto monitoring mode for heart rate or 7 days when in the instant detection mode. It only takes 2 hours to charge and can be used for up to 7 days. ( It is recommended to turn off rarely used functions to save battery life. ) This smart bracelet is compatible with any smart phones that use iOS 8.0/Android 4.4 or above and supports 17 kinds of languages.