The new Adesso optical trackball is ergonomically designed, featuring a scrolling wheel and a large detachable ball. It is incredibly dependable, as well as comfortable for most business, recreational or design applications. The large optical trackball eliminates the need for a mouse and saves valuable desk space. With its 800 DPI resolution, the optical trackball provides superior accuracy and smooth motion, requiring minimal hand movement and virtually no maintenance. The trackball is ergonomically contoured and fits comfortably to a user's palm.