Solar-powered wireless keyboard charges itself whenever there's light and stays charged for at least three months in total darkness, eliminating the need for batteries, power bricks and charging cables. Thin keyboard features advanced 2.4 GHz wireless connectivity that gives you the reliability of a cord plus wireless convenience of fast data transmission, virtually no delays or dropouts, and 128-bit AES encryption. The included tiny Logitech Unifying receiver is small enough to stay in your laptop, so there's no need to unplug it. Plug-and-play receiver also allows you to add compatible mice and keyboards without the hassle of multiple USB receivers. Wireless Solar Keyboard K750 features a concave key cap design and compatibility with Windows XP, Windows Vista and Windows 7. Keyboard includes a wireless extender and cleaning cloth.