Sennheiser EW 100-ENG G2 Wireless Lavalier Microphone System, with BodyPack Transmitter,Plug-on Transmitter, Camera Receiver Included Pilot tone squelch for eliminating RF interference when transmitter is turned off High-quality true diversity reception Automatic frequency scan feature searches for available frequencies Absolutely reliable transmission and extended range due to high RF output power 1,440 tunable UHF frequencies for interference-free reception