support blood oxygen detection, helping you adjust yourself for a healthier lifestyle.[Multiple Sports Modes] Support 117 kinds of sports modes, such as running, cycling, walking and so on, meeting your different exercise needs.[Smart Reminder] Provide synchronous display of message, call or social APP to remind you of important information.[More Functions] Raise your hand to brighten the screen, Breath training, Weather, Find phone, Phone unlock, Remote camera, Sedentary reminder, Calendar, Alarm, Compass, etc.3.Specification:Item name: Redmi Watch 2Model: M2102W1Color: Black / White / Blue (optional)Screen: 1.6 inches AMOLEDResolution: 320*360 pixBT version: BT5.0Battery Capacity: 225mAhStandby time: 7-12 daysWaterproof level: 5ATMSensor: Optical heart rate sensor, acceleration sensor, gyroscope, geomagnetic sensor, ambient light sensorPositioning: GPS/GLONASSS/GALILEO/BeidouApp: Xiaomi Wear APP(Android) / Xiaomi Wear Lite(iOS)Compatibility: Android 5.0, iOS 10.0 and aboveStrap length: 125-205 mm adjustableSize: 39.1*34.4*9.98 mmWeight: 31 g4.Note:Sleep less than 20 minutes will not be recorded.The accuracy and sensitivity of automatic sport mode recognition vary from person to person, and it is related to the posture and proficiency of sports events.This product is not a medical device, the measurement data and results are for reference only, not as a basis for diagnosis and treatment.Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same.The product warranty is only for customers in China, foreign customers cannot be guaranteed. Thanks for your understanding.5.Package List:1 * Redmi Watch 21 * Charging Cable1 * User Manual(CN)