"Special function health smart watch Screen size 0.96 inches Waterproof level Waterproof Shape square Battery composition Lithium-ion battery Color screen: 0.96 inch IPS color technology, a substitute for TFT color screen. New high-definition bright color display. Let the bracelet no longer be monotonous; health and fashion Dynamic heart rate and automatic sleep monitor: A fitness tracker can monitor active heart rate and upload real-time heart rate data to a mobile phone application. In addition, it also supports automatic sleep monitoring, recording deep sleep, light sleep, and wakefulness. All health data are displayed as graphs, clearly confirming your physical condition throughout the day Multiple functions: female menstrual period reminder, countdown, 24-hour continuous blood pressure and heart rate monitoring, stopwatch, reminder, running mode, customizable clock face, fatigue test, calorie counter, mileage, call reminder, SMS/social network reminder , Sleep monitoring, remote shutter, search for phone, sedentary reminder No charger required: built-in USB plug, convenient to use any USB module and computer to charge; no charging cable and base; one charge can provide you with up to 7 days of working time (note: the battery can last for 3-5 days after being loaded; (It can last for 5-7 days when the battery is running out) Compatibility: APP ""H Band"" requires a Bluetooth 4.0 smartphone. Support system: iOS 8.0 or above (iPhone 4S, iPhone 5/5S/5C, iPhone 6/6Splus, iPhone 7/7S plus, iPhone8 iPhoneX, etc.). Android 4.4 or above (Huawei Mate7/P9, LG, Samsung, etc.). If you are not satisfied for any reason, please feel free to contact us."