Specification Hardware Brand: SMA Bluetooth Version: Bluetooth 4.0 Waterproof: Yes Functions Bluetooth calling: Caller's name display,Phone call reminder Messaging: Message reminder Health tracker: Heart rate monitor,Pedometer,Sedentary reminder,Sleep monitor Remote control function: Remote Camera Anti-lost: Yes Groups of alarm: 8 Alert type: Vibration Other Function: Alarm,Stopwatch Screen Screen: LCD Operating mode: Press button Battery Type of battery: Polymer Battery Battery Capacty: 180mAh Standby time: 40 Days General People: Female table,Male table Dial and Band Shape of the dial: Rectangle Case material: Aluminium Band material: TPU Features Compatible OS: Android,IOS Compatability: Android 4.4 / iOS 8.0 and Above Systems Language: English,Simplified Chinese Available Color: Black,Blue,Red Weight and Size Dial size: 4.25 x 3.65 x 0.97 cm / 1.67 x 1.44 x 0.38 inches Band size: 25 x 1.8 cm / 9.84 x 0.71 inches Wearing diameter: 14.7 - 21 cm / 5.79 - 8.27 inches Product size (L x W x H): 25.00 x 3.65 x 0.97 cm / 9.84 x 1.44 x 0.38 inches Package size (L x W x H): 15.50 x 12.20 x 2.10 cm / 6.1 x 4.8 x 0.83 inches Product weight: 0.0390 kg Package weight: 0.1330 kg Package Contents Package Contents: 1 x SMA - TIME Smart Watch, 1 x Charging Cable, 1 x Chinese and English User Manual