Wireless keyboard-and-mouse combo puts convenience and control comfortably at your fingertips whether you use a laptop or desktop. Whisper-quiet, concave, low-profile keys position your fingers properly and offer softly rounded edges. One-touch media controls let you mute your computer or skip to the next song instantly without using your mouse. Keyboard design also features a full-size layout, palm rest, up to three-year battery life and folding legs to increase the tilt to 8 degrees for your ergonomic needs. Laser mouse feels good in either hand thanks to a contoured design with soft rubber side grips. Mouse battery lasts up to one year. Tiny wireless receiver connects both the keyboard and mouse. With advanced 2.4 GHz wireless, long-range wireless connection virtually eliminates delays, dropouts and interference. Wireless Keyboard/Mouse Combo MK520 comes with three AA alkaline batteries installed and requires Windows XP, Windows Vista or Windows 7, USB port and Internet connection.