The Optical Computer Mouse is a computer mouse for the true college fan. With smooth optical precision and quality construction, it's the best computer mouse value you'll find - and with college spirit style to boot. Whether you're left or right handed, you'll appreciate the dexterity of your very own optical University Mouse. The scroll-wheel/button can be used for fast browsing up/down on the Internet and in all of your favorite documents without using the scroll bar. The optical sensor replaces your plain old mouse ball. It accurately tracks movement by scanning your desktop several thousand times per second. The Optical Computer Mouse supports PS2/USB for Windows 95, 98, ME, NT 4.0, XP, MAC OS 8.6, 9.0, OSX.