Logitech® First Mouse+ mouse offers a unique wheel button which provides scrolling on all Windows® 95, Windows® 98, and Windows® NT 4.0 applications without using the scrollbars. It is also a third mouse button. MouseWare® software makes it easy to customize the buttons with one-click commands, including double-click, cut, and paste, to work better in all Windows applications. The comfortable First Mouse+ is designed to be used with left or right hands. It's built with the quality of Logitech, the world's largest mouse manufacturer and includes a 2-year warranty.