Main features: Ultra-thin curved AMOLED display I aviation aluminum integrated material | guardian scientific sleep | high-precision all-day health detection | long endurance AMOLED curved screen: A new generation of 1.85 inch HD large screen, high pixel display resolution and professional sharp screen display technology, so that each aspect of the display clear smart narrow frame design, bring more open visual enjoyment. Bluetooth call Information synchronization: Synchronous mobile phone calls,SMS,wechat,QQ,Facebook and other social information push Bluetooth hands-free call, high-definition original sound intelligent vibration reminder, can also be set to mute, easily adjust the call mode according to demand. 100+ movement modes: Support running,cycling,climbing and other sports modes to meet your diverse needs, providing heart rate,speed, distance,calories burned and other data to help you understand the state of exercise. Heart rate monitoring: Built-inopticalhear rate sensor, 24 hours of continuous heart rate monitoring to help you understand your heart rate, prevent potential heart problems, at any time according to heart rate changes to adjust the exercise time and amount of exercise. Sleep monitoring function: Track your sleep quality through out, including deep sleep, light sleep and REM stages. By analyzing sleep data each night and offering suggestions for improvement, IP68 waterproof: Whether swimming, soaking in the rain or washing your hands, you can easily-cope with it and wear it without worry. It also has a unique built-in drainage function to effectively prevent water accumulation. Screen size: 1.85 inches Resolution: 390*450 System requirements: iOS 8.0 or later Android 4.0 or later Bluetooth: 5.0 BLE Main control chip: Zhongke fourth generation 5691 Battery capacity: 180mAh Standby time: 15 days Battery life: 5-7 days Charging method: Magnetic charging Motor: Built-in motor