Wireless Media Controller for Lantern Slide radio frequency laser pointer, page up/down, blank screen, play slide and built-in flash memory(512M-4GB)For lantern slideControl distance: 15m/49-feetBattery: CR2032x1Standard color: white/blackSize: 8.7 x 3.35 x 0.9cmPacking: mini gift boxUSB plug-and-play, no driver requiredOperating system: Windows 98, SE, ME, 2000, XP, Mac OS, Linux and ...