Logitech Wireless Touch Keyboard K400 with Built-In Multi-Touch Touchpad Easy and comfortable typing on quiet keys with bold, easy-to-read characters Large (3.5-inch) touch-pad with multi-touch navigation for easier web browsing Control your TV-connected laptop from the couch with 33 feet/10 meter wireless range Plug the tiny Logitech Unifying wireless receiver into your laptop and start surfing the web Works with Windows 7, Windows Vista and Windows XP