2.4 Ghz wireless multimedia keyboard This keyboard benefits from additional function keys allowing quick & easy access to your music & T.V The touchpad is placed to the side of the keyboard to reduces the risk of strain incurred when using a mouse 13 multimedia keys & mouse scroll wheel Up to 10 metres effective working range 360 degree navigation Wireless keyboard gives you the freedom to use on your lap or on a table top Number of Keys 86 Power source 2 x AA batteries included Key Switch Lifetime 10 million operations OS Compatible Win 2000 XP Vista Win 7 Keyboard dimensions 425 x 150 x 31.5mm Receiver dimension 21.5 x 78 x 10mm Weightapproximately 907g