Specifications:

Adesso 2.4 GHz RF Wireless Multimedia/MCE Keyboard with Optical Trackball...The freedom of wireless comes with Optical Trackball Scroll Wheels Windows Key Multimedia Control Keys Internet Hot Keys and (MCE) Media Center Edition controls all are built in. If you are looking the most cost effective efficient and productive personal wireless keyboard you will use this one is for you. It has quick access to MCE home entertainment with a touch of the button. This lets you operate you most of the multimedia software with easy access to the control keys. It is wireless lightweight and stylish which offers mobility and comfort. It is ideal for Windows Vista and XP with MCE. 2.4 GHz USB Wireless Interface; Wireless connectivity with 16 Channels and 65536 IDs per channel; 800 DPI optical trackball for easy navigation; Range distance from receiver is 100 ft.; Quite tactile keys for smooth typing; Easy to use Scrool Wheel with left and right click option; Laser printed keycaps for longer wear; Media Center Edition Multimedia and Internet Hot Key controls; Light weight and elegant design. Includes 103-Key Keyboard USB Receiver User's Guide.