... PowerPoint presentations! It contains two parts: transmitter and usb receiver. Parameter Transmitter RF Frequency433.92Mhz/2.4GhzRF Output Power0dBmControl distance ... 3VSleep current 1UADimension 87*33.5*9mm Weight 17g Receiver Receive frequency 433.92Mhz/2.4GhzSensitivity-90dBm Operation system ... 98. Se,Me, 2000, XP, Win7,8,Mac OS, Linux, VistaUSB version USB2.0 , compatible with USB1.1 Working ...