Whether you're left or right handed, when you're working on your computer day and night, you want more flexibility and comfort. That's what you'll get with the Trackman® Marble® mouse. The stays-put trackball design keeps your hand comfortable and supported all day. The 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. Connector/Port/Interface: PS/2; USB; Left/Right Hand Use: Left/Right; Mouse Technology: Optical; Wired/Wireless: Wired.