... .4GHz technology CE,FCC,RoHS certificate V820 Wireless presenter with trackball mouseIt is a great tool for PowerPoint presentations ... . Operation SystemWindows 98,Se,Me,2000,XP,Vista, Mac OS, LinuxIII. InstallationPlug the receiver into the USB ... batteries55gReceiverInterfaceUSBOperation systemWindows 98/Se, Me, 2000, XP, Vista,Mac OS, LinuxCompatible plugUSB1.1, compatible USB2.0Working voltageUSB ...