Aprolink BND04 AproGear Bluetooth Wristband-Black Discover a whole new experience to super-fitness where you can monitor Activity Trackers & Pedometers, Interactive APP, Advance Diagram Analysis, Clock Function and many more. It help you to track steps, calories burned, distance, active time, set personal info, view charts and history data, wear to bed and know sleep quality and it has Bluetooth Low Energy 4.0：Sync to smartphone and PC with ultra low power consumption which makes your manage daily routine life easier. Please download app keyword is "AproGear" from your apps store. Please read manual before using it.