Kensington KMW64327 Trackball

Kensington Stationary Orbit Optical Trackball - Optical - Cable - White - 1 Pack - USB, PS/2 - Scroll Ball - 2 Button(s) - Symmetrical; Navigate with greater comfort and precision while saving valuable desktop space with the Orbit Optical Trackball. Its optical technology delivers precise cursor control with the touch of a finger while the two-button design provides an interface that's familiar to mouse users. USB connection delivers instant plug-and-play use. Ambidextrous trackball can be used with left-handed or right-handed users on PCs and Macs. USB and PS2 connectivity offers greater compatibility.;