The Sound Barrier SB-503UFHL Wireless Microphone System includes wireless body-pack transmitter, headset & lavalier microphone. The SB-503UHFL microphone system is easy to setup, easy to use, and offers reliable wireless sound transmission with today's latest UHF system technology. Ideal for almost any sound production where a hands-free solution is required. This system is single channel with fixed frequency making it easy to use and setup.