?Features: Perfect support Android Smartphone which OS is Android 4.3 or above with Bluetooth 4.0 and for iPhone 4S and above. For Android user， you must download the "WristbandApp" in the PlayStore and for IOS user， you must download the "Wristbandapp Fitness" in the APP Store. Track steps taken， distance traveled， calories burned， stairs climber and active minutes throughout the day. LED screen， clearly displays time. Monitors how long and well you sleep. Slim， comfortable and easy to wear. Specifications： Color: Black， Blue， Rose (Optional) Material: Silica gel Display: LED screen Bluetooth: 4.0BLE Battery: 80mAH battery Charging time: Approx. 2h Standby time: Approx. 300h Charge method: Standard USB charging Monitor size: Approx. 4.6 * 2.3 * 1.05cm / 1.8 * 0.9 * 0.4in Monitor weight: Approx. 9g / 0.3oz Package size: Approx. 20 * 8.5 * 3.3cm / 7.9 * 3.3 * 1.3in Package weight: Approx. 77g / 2.7oz Package including: 1 * Monitor 1 * Wrist band 1 * User manual (English) 1 * USB cable