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 Logitech 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.