Feature: Compatible systems: IOS7.1 and above, Android 4.4 and above Main functions: heart rate monitoring, step counting, calorie burning, distance, RTC display, automatic sleep monitoring, call reminder, information push, alarm reminder, anti-lost, remote control camera, etc. Waterproof and dustproof: sweat, rain, splash water Specifition: Display screen size 0.96 inches Screen type: OLED Connection parameters: Bluetooth Low-cost Bluetooth 4.0 synchronization Other parameters: appearance material TPE Product Size: Main Body: 43x18x12mm Strap: 245x20x12.8mm Product net weight: 28g Product color: black, red, blue, green Other features: touch screen: full touch screen Control method: key switch Data Storage: Record 7 days of detailed exercise data Battery Type: Polymer Lithium Battery Life time: 5-10 days Charging method: USB charging Pull out the strap at both ends of the bracelet. Please insert the metal end USB plug of the wrist strap into the USB port of the computer or mobile phone to charge it. When charging, the bracelet will automatically turn on. Packing: 1 x smart watch 1 x manual