Satechi SP600 Smart-Pointer (Black) 2.4Ghz RF Wireless Presenter with Mouse Function and Laser Pointer Compact and lightweight - only 2.2 oz (with two AAA batteries) so it easily fits in a pocket or carrying case Universal compatibility - 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 Downloadable Smart KeyMap software utility allows custom programming of the button functionality on the remote. RF 2.4Ghz Wireless gives you freedom of movement of 100 ft. - no need to aim the receiver