DESC: Take advantage of the superior precision and maintenance-free operation of optical technology. With a sleek design and intuitive placement of the ball, scroll wheel, and buttons, the TrackMan Wheel is perfect for long hours of use. It fits comfortably in your right hand and delivers smooth, ultra-precise tracking through Logitech's optical Marble technology. And because it records motion optically instead of with mechanical parts, there's no need for regular cleaning.