Performance, comfort and reliability are critical in any office environment. The Pro Fit range delivers performance and comfort that business users require, day after day, without any fuss. Designed specifically for the business professional, the Pro Fit range is the perfect step up from entry-level input devices, delivering performance that can be relied upon. The Kensington Pro Fit Mid-Size Optical Mouse is a convenient and reliable office tool. With extra thumb buttons for navigating back and forward, you'll smoothen your workflow. This mouse is also designed to last, resists drops and spills, and has a three-year warranty.