Av-jefes Vl623/h4p Headset Microphone for Audio Technica Compatible with Audio-Technica body pack transmitters: T27, T31, T51, T200, T210, T300, T310, T801, T901, 1100 Series, 1400 Series, 2000 Series, 3000 Series. Flexible and slim gooseneck boom for close talk and easy mic positioning, Lightweight and comfortable Bendable boom and adjustable wire frame for easy adjustability and perfect fit RoHs and REACH Complied. Without Pb, Hg, Cd, Cr6+, PBB, PBDE. Bodypack Transmitter Not Included