Kensington K72337EU Orbit Trackball with Scroll Ring 31722J

Scroll Ring and Medium BallSpin the dial to move up and down web pages or documents with complete ease. The blue 40mm ball has been specially designed with an absolute spherical hard surface for precise tracking and control.TrackballWorks CustomizationFree downloadable software provides an even more personalized experience giving you the ability to assign a wide variety of program functions to each of the 2 buttons as well as adjusting cursor and scrolling speedsOptical Tracking TechnologyProvides precise cursor movement for superior accuracy so you can get where you want o