Right-handed comfort in a ergonomically-designed plug-n-play mouse. The Kensington Pro Fit (TM) Full-Size Mouse USB/PS2 has an ergonomic, right-handed shape with a soft rubber grip for all-day comfort. It features a high-definition optical sensor with a pointer speed quick-select button for enhanced productivity. It has the plug-and-play reliability of a wired USB or PS2 connection. Features include a central scroll wheel with a middle button. And it is built to last with a limited lifetime warranty.