ERGONOMIC AND ENERGY-EFFICIENT: The pads on the back ensure maximum comfort and securely hold the Bluetooth number pad in position. It will automatically enter power-saving mode after 15 minutes of inactivity, and pressing any key will wake the keypad. Powered by 1* AAA Battery (not included). SIMPLE SETUP: Getting started is easy; just plug the receiver into a USB port and begin entering numbers immediately. The USB receiver is stored in the battery compartment of the keyboard, with no drivers required. The keys are quiet and easy to press, significantly enhancing your productivity. QUIET SOFT TOUCH: The integrated ergonomic tilt offers additional comfort, helping to reduce strain, ideal for those working with spreadsheets, accounting files, or financial applications. USER FRIENDLY: A battery indicator light notifies you when the keypad's AAA battery is low. Conveniently placed directional control keys can also function as joystick controls, allowing you to enjoy gaming with a wireless device.