: Smart Wristband can be adjusted according different conditions/size. Compatibility : Android OS must be Android 4.4 or above, Bluetooth 4.0; iOS OS must be iOS 8.0 or above, Bluetooth 4.0 App Download : Search 'H Band' on App store, Google Play, or Scan the QR code on the User Manual and instll it. BOTH STRENGTH AND APPEARANCE : The screen is large 0.86 inch OLED display, show more content. Two Display mode, vertical screen and landscape, one key to switch display mode Record motion data all day - Movement steps, calories, movement distance. 24 hours of continuous recording provides a complete movement curve and the amount of movement per hour, correctly judges your exercise intensity and chooses a reasonable way to adjust the rest. Sleep Full Monitoring, Vibration Alarm Wake - Wristband automatically tracks how long and how well you sleep. Silent vibration alarm clock wakes you gently every morning. Call vibrate, no longer miss important calls - In order to prevent missing important calls exist, after wristbands and mobile phone APP connecte, when the phone ring, wristbands will gently vibrate to remind you IP67 Super waterproof - cold shower can also be assured to wear, not only protects against daily dust particles but also can even direct rinse with cold water, cold shower. Package Included : 1 X Smart Wristband 1 X Charge cable 1 X Manual