Whether you're left or right handed, when you're working on your computer day and night, you want more flexibility and comfort. And that's what you'll get with the Trackman® Marble® mouse. The stays-put trackball design with a long, broad palm area and gentle curves keeps your hand comfortable and supported all day. The conveniently-located button controls let you move forward and backward with ease, and you’ll enjoy fast, accurate cursor movement with just a move of your finger. Plus, the patented Marble® optical technology gives you smooth tracking on almost any surface, so you can be productive wherever you work.