The Connect-IT Vertical Mouse offers a much larger mouse for a more comfortable use. The ergonomic shape, where one part is noticeably raised, corresponds better to the natural position of the palm. This means less effort and strain on the wrists and fingers, so you can be productive for longer, especially if you are an active everyday user. With the CONNECT IT CMO-2500-BK Vertical Ergonomic Mouse's shape, you can avoid hand pain from intensive use of your computer. The movement on the pad itself is accurately recorded by an optical sensor whose sensitivity can be set at 3 degrees. In addition to controls that include a wheel, you can also find the resolution button and 2 additional buttons to make pages easier to navigate.