SANOXY® 2.4Ghz RF Wireless Presenter with Mouse Function and Green Laser Pointer * Compact and lightweight - only 2.2 oz (with batteries) so easily fits in pocket or carrying case * works with Windows 7, Vista, XP, Mac OS with one USB Port * Presentation Functions - Page Up, Page Down, Up Arrow, Down Arrow, PowerPoint Darken Screen, Start PowerPoint Presentation, Alt-Tab Application Switch * Just plug and play and you are ready to go - no software is required