Crelander D2 Fitness Oled Bluetooth Smart Watch Waterproof Bracelet Health Watch Phone Wristband Wrist Wrap Sports Pedometer with Sports Sleep Tracking for Android 4.3 or Above And IOS 7.1 Or Above For Apple Iphone 6/6 Plus/6s Black The sleep monitoring: deep sleep/shallow sleep, monitoring your sleep duration and sleep quality STEP Motion control, meter, movement range, calorie consumption Use PVC Material, Waterproof IP57, Make your Sports Way Easy and Protective. Support Bluetooth 4.0, Connect to your Mobile phone or Tablet PC, Analyze Your Health. Support Android 4.3 or Above & IOS 7.1 or Above, Both Android and IOS Systerm Support.