Using Silent Technology, silent click switches and rubber covers, the Silent Wireless Mouse and Keyboard are truly silent. Plug-and-forget nano receiver connects mouse and keyboard to your computer. This included nano receiver is small enough to plug in and leave connected. The 2.4GHz wireless performance allows a lag-free connection. Silent Mouse features Blue LED technology, allowing you to point and click on more surfaces than other mice - from a glass table to the granite kitchen counter. Ergonomic design of the mouse provides a comfort grip for easy use. Silent Keyboard features a full numeric keypad and full-size function keys all within a slim, efficient design. Mouse and keyboard are compatible with Windows and Mac platforms. They run on four AAA batteries.