KENSINGTON® SLIMBLADE WIRED TRACKBALL

Multi-function ball lets you easily navigate through your music, pictures and documents using media or document view mode
 
Product Features
•  Control cursor and scrolling; volume, play/pause, stop, and next; zoom in/out, and pan, all with the ball
•  Keep an eye on which application you are in and which function is being performed with the heads-up
•  With its low-profile shape, you'll be able to use it comfortably for hours on end
•  Sleek design saves your desk space
•  Can dock into the slimblade media notebook set
•  Mac & PC compatible, including Windows Vista, Windows XP, and Mac OS X