Compatible with Sennheiser transmitters: Evolution Series, EW100, EW300, EW500, G1,G2, G3, SK1093,SK20,SK300;Super Lightweight! Extremely flexible and easily adjust to fit over the ear of any user.;High quality voice/sound pickup.;RoHs and REACH Complied. Without Pb, Hg, Cd, Cr6+, PBB, PBDE.;Great for lecturers, preachers, sportscasters, surveillance, stage performers.