General Brand: Original XiaoMi Bluetooth version: V4.0 Waterproof Rating: IP67 Color: Black Compatability: Android 4.4 and above / IOS7.0 and above Special Features Health tracker: Measurement of heart rate,Sleep management,Pedometer,Calories burned measuring,Steps counting,Distance recording,Sedentary reminder Other functions: Unlock phone without password,Call/APP message reminder,Time,Alarm Clock Alert type: Vibration Sensors: ADI ultra low-power acceleration sensor + photoelectric heart rate sensor Working temperature: -20 C ~ 70 C Display Screen: 0.42 inch OLED Display Dialog Touch key: Yes Battery Battery type: Lithium polymer battery Battery capacity: 70mAh Standby time: About 20 days Input current: 45mA (TYP), 65mA (MAX) Input voltage: DC 5V Material Mi-core material: Plastic + Alloy Case material: TPEE Band material: TPSiV Weight and Size Band total length: 235 mm Adjustable length: 155-210 mm Alloy Body Dimension (L x W x H): 40.3 x 15.7 x 10.5 mm Product weight: 7.0g Parcel: 1 PCS* smart Bracelet Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!