Kensington Expert Mouse Pro Wireless Comfort Trackball for Windows or Mac- 64245 Kensington Edge: 10 buttons and wireless, too - to speed through repetitive tasks and get you where you want to go on the Web. A user says - I love this mouse! Bonus translucent wrist rest lifts your wrist to a more comfortable level Large ball for precision pointing and easy control combine with steel bearings for smooth cursor movement and durability. Rubberized scroll wheel speeds through long documents and Web pages, Windows or USB Mac compatible