Product description:US ADI sensors to detect movement and sleep quality Light-sensitive version of the real-time monitoring of heart rate, sports scienceMonitor your activity levels, track walking distance and calculate calories burned. Achieve the daily exercise targets you set and work towards a healthier lifestyle!Monitoring of heart rate Real-time monitoring and recording, scientific planning exerciseAutomatic sleep monitoring analyzes your sleep quality.Sync with the app to analyze your fitness and sleep activities to help you improve your lifestyle.Silent alarm helps wake you up every morning with vibration.Call reminder: it will tell you when a call comes.Specifications:Battery capacity: 45mAh Standby time: 10 days Batteries Type: Lithium Polymer Input Current: 25mA (TYP) Input voltage: DC5.0V Waterproof: IP67 Heart rate sensor: Optical heart rate sensor Adjustable length: 157 x 205mm Measuring method: Photoelectric volume pulse wave Plethysmography (PPG) Bluetooth chip: Dialog top Bluetooth chip (Bluetooth 4.0) Sensor: ADI military gravity sensor App: Mi Fit Language: English, Chinese, Russian, Spanish, Polish, Portuguese, Turkish, French, German Compatibility: Android 4.4 and above versions, and supports Bluetooth 4.0 for Android smartphones; Adapter For Apple iOS 7.0 or later and For iPhone 4s / 5 / 5c / 5s / 6/6 Plus / 6s / 6s Plus. Bracelet unlock Supported models: Xiaomi 2 / 2S / 2A, Xiaomi 3, 4 Xiaomi , Xiaomi Note, Xiaomi 4C, Redmi 1S, Redmi 2 / 2A, Redmi Note, Redmi Note2 (need to upgrade to MIUI6 and above systems), Bluetooth 4.0 Android 5.0 over the phone. Package Includes: 1x MI band 1S chip1x Black wrist strap1x Charger Cable1x User manual Monitor your activitylevels, track walking distance and calculate calories burned. Achieve the dailyexercise targets you set and work towards a healthier lifestyle