Kensington Expert Mouse Pro Wireless Trackball with 6 Direct Web Buttons. THE premier mouse, with a wireless connection. Clear up some of the clutter on your desktop! Six Direct Launch Buttons give access to Web sites of your choice or your favorite applications, plus four programmable mouse buttons to streamline frequent tasks. There's even a scroll wheel to help you zip through documents and web pages. This is a great mouse for designers or gamers, or anyone who spends a lot of time on the computer - and it's designed for left or right hand use. The large ball and ergonomic design combine with a bonus wrist rest that positions your hand properly to ensure hours of comfortable use.