Logitech 931006-0403 Cordless Optical Mouse for Notebooks Portability - Take this compact mouse anywhere and store it in the carrying case when not in use Freedom - Logitech's Fast RF technology means cordless without compromise Convenience - Enjoy smooth operation thanks to the advanced optical sensor that doesn't require a mouse pad Comfort - Use it with either hand Comes with four pre-programmed buttons, or customize them yourself with Logitech MouseWare software