AV-JEFE CM520 Professional Lavalier Microphone for Audio-Technica Wireless Systems _ Great for Interview, Broadcasting, Conference, Speech & Leacture Great Quality Professional Lapel Microphone for Interview, Speech, Broadcasting, Lecture and Conference! Compatible with Audio-Technica transmitters: T27, T31, T51, T200, T210, T300, T310, 1100 Series, 1400 Series, 2000 Series, 3000 Series "NOT" Compatible with: T35, T75, T211, T601, 1000 Series, 1200 Series, 4000 Series, 5000 Series, 7000 Series RoHs and REACH Complied. Without Pb, Hg, Cd, Cr6+, PBB, PBDE. Provides Flat, Smooth Frequency Response and Wide Dynamic Range