The Targus USB 3-Button Laser Notebook Mouse provides 20x more tracking sensitivity than an average optical mouse providing accuracy and improved use on shiny surfaces as well as 2 user selectable resolutions offering different levels of precision and cursor speed. 20x Better tracking sensitivity than a typical optical mouse, 2 Selectable resolutions; 1000 & 2000 DPI, USB connectivity ensures hassle free set up, Windows 2000, XP & Vista compliant.