Shure FP15/83 Combo Wireless System, G4 Includes FP1 Bodypack Transmitter, FP5 Portable Receiver, and WL183 Microflex Omnidirectional Lavalier Microphone Wireless portability for the freedom to go wherever the job requires Automatic frequency selection that locates an open frequency at the touch of a button & automatic transmitter setup that instantly syncs the transmitter to the receiver frequency Diversity antennas for consistent reception of signal transmission Rugged and reliable Shure construction