Retractable Laser Stow N Go Mouse 2.5-feet retractable cord stows under the mouse for easy travel Programmable scroll button for zoom, magnify and more A single button allows users to quickly switch between 1600/1200/800 DPI settings which adjusts cursor speed for widescreen laptops System Requirements - Windows 2000, XP, Windows Vista or Mac OS X or higher, and USB port Exterior Dimensions - 3.75 x 2.44 x 1.38