Av-jefes Tcm141ll-h4p Lavalier Microphone for Audio Technica Element: Electret Condenser RoHs and REACH Complied. Without Pb, Hg, Cd, Cr6+, PBB, PBDE. Cord Length: 65 Inches Compatible with Audio-Technica body pack transmitters: T27, T31, T51, T200, T210, T300, T310, 1100 Series, 1400 Series, 2000 Series, 3000 Series. Not compatible with: T35, T75, T211, T601, 700 Series, 800 Series, 1000 Series, 1200 Series, 4000 Series, 5000 Series, 7000 Series.