Wireless keyboard features laser-etched, backlit keys that you can see easily in any light. The PerfectStroke key system helps make every stroke fluid and whisper-quiet. Concave design and softly rounded edges of the durable Logitech Incurve keys position your fingers properly. Flexible recharging eliminates the need for disposable batteries. Simply plug in the universal micro-USB cable for up 10 days of battery life on a single charge. Even use the keyboard while it's recharging. Advanced 2.4 GHz wireless delivers a long-range wireless connection that virtually eliminates delays, dropouts, and interference. The tiny included Logitech Unifying receiver stays in your laptop so there's no need to unplug it, risking loss or damage. Plug-and-play receiver also allows you to add compatible mice and keyboards. Wireless K800 also includes a micro-USB charging cable and receiver extender cable, and is compatible with Windows XP, Windows Vista and Windows 7.