FEATURES- MiniScroller Optical 3 button USB/PS2 Mouse with Scroll The MiniScroller Optical Mouse enables you to program the left button for frequently used commands such as Page Up, Page Down or Double-Click. Scroll and Zoom control is at your fingertips. Discover fluid, optical motion when you navigate documents and the Internet. The MiniScroller Optical Mouse uses an optical sensor that photographs surface patterns at 1500 frames per second. * Engineered with the latest optical components. * Beyond the Mouse Pad! The MiniScroller adapts to virtually any surface. * No More Rubber Ball! The embedded optical sensor has absolutely no mechanical parts to clean. * Razor-Sharp Control! Featuring the Latest breakthroughs in control, including auto-scroll, one-click functions you program yourself, and one- touch zoom action. * Small and compact for road warriors. * USB or PS2 compatible. * Works with Windows 98, 2000, Me and XP. * Full Lifetime Warranty * Please note: The optical sensor functions on surfaces with visual texture. Transparent surfaces (i.e., glass) and reflective surfaces (i.e., mirrors) will diminish mouse control.