Kensington Orbit Optical Trackball
Navigate with greater comfort and precision while saving desktop space with the Kensington Orbit Optical Trackball. Its optical technology delivers precise cursor control with the touch of a finger and the two-button design provides an interface that's familiar to mouse users. It compatible with both PCs and Macs.
For more information, please visit http://www.kensington.com/kensington/us/us/p/1444/K64327F/orbit%E2%84%A2-optical-trackball.aspx.