... : radio frequencyFunction: laser pointer, page up/down, blank screen, play slide and built-in flash memory optional (512MB to 4GB)Control distance ... : 8.7*3.35*0.9cmPacking: mini gift boxUSB plug-and-play, no driver requiredOperating system: Windows 98, SE, ME, 2000 ... , XP, Mac OS, Linux and VistaSize: Transmitter 92*27*10mm Receiver 85*27*10mm RF ...