Patent number: ZL 2006 3 0153839.5 Technology: radio frequency Function: laser pointer, page up/down, blank screen, play slide and built-in flash memory optional (512MB or 4GB) For lantern slide Control distance: 15m/49-feet Battery: CR2032x1 Standard color: white/black Size: 8.7 x 3.35 x 0.9cm Packing: mini gift box USB plug-and-play, no driver required Operating system: Windows 98, SE, ME, 2000, XP, Mac OS, Linux and Vista