... parts: transmitter and USB receiver.I. Operation SystemWindows 98, Se, Me, 2000, XP, Mac OS, Linux , Windows ... Attention PLS: you may need Win98 disk if your computer runs under Win98/SE operating system.PLS keep clear ... 5V1.5VSleep current1uA1uAWavelength650nm650nmMax output< 1mW< 5mWDimension142x20x21mm142x20x21mmReceiverOperation systemWindows 98,Se,Me,2000,XP, Mac OS, Linux, Windows VistaCompatible ...