Crelander E2 Incoming Number Display Fitness OLED Bluetooth 4.0 Smart Watch Waterproof Bracelet Health Watch Phone Wristband Wrist Wrap Sports Pedometer with Sports Sleep Tracking Step count for Android 4.3 or Above & IOS 7.1 or Above for Apple Iphone 6/6 Plus/5s Important:Pls press the ON/OFF button after connected with the charger to charge,and pay attention to insert it charging,because you can also insert it in opposite way. The sleep monitoring: deep sleep/shallow sleep, monitoring your sleep duration and sleep quality Camera Remote Button; STEP Motion control, meter, movement range, calorie consumption Use PVC Material, Waterproof IP57, Make your Sports Way Easy and Protective.Incoming Call Number Display and Vibration, Anti Theft; Support Bluetooth 4.0 Support Android 4.3 or Above & IOS 7.1 or Above, Both Android and IOS Systerm Support.