Specification: Compatible system: IOS7.1 and above, Android4.4 and above Main functions: step counting, calorie burning, distance, RTC display, automatic sleep monitoring, call reminder, information push, alarm clock reminder, anti-lost, remote camera, etc. Waterproof and dustproof: sweat, rain, splash water Display screen size 0.96 inches Screen type: OLED Connection parameters: Bluetooth, low energy Bluetooth 4.0 synchronization Appearance material: TPE Size: main body: 43x18x12mm; strap: 245x20x12.8mm Net weight: 28g Color: black, red, purple, blue, green Battery type: built-in polymer battery Life time: 5-10 days Charging method: USB charging Color: red, purple, green, black, blue Model: Common model, temperature measuring model. Features: Sleep Monitoring: automatically monitor your sleep duration & consistency with comprehensive analysis of sleep quality data, helping you adjust yourself for a healthier lifestyle All-day activity helper: Accurately record all-day activities like