Now the ball does it all Your computing experience just got smoother, faster and easier with the Kensington SlimBlade(TM) Trackball. Choose navigation mode to control cursor and scrolling. Media mode controls volume, play/pause, stop, and track forward/backward, while view mode zooms in/out, and pans. And it does it all with the ball to put complete control at your fingertips. You can even keep an eye on which application you are in and which function is being performed with the heads-up display on your monitor. Mac and PC compatible, including Windows Vista, Windows XP, and Mac OS X. USB 2.0.