idea: A mid-sized mouse for full comfort. Comfort and reliability are critical in any office environment. And the Kensington Pro Fit™ USB/PS2 Wired Mid-Size Mouse delivers both. The mid-sized right-handed design feels great in the hand while the wired plug-and-play connectivity delivers high reliability and zero setup. - Mid-size, right-handed design for lasting comfort - Dedicated forward and back buttons - Designed to withstand drops and spills - USB/PS2 connection delivers instant plug and play use