Yaesu VC-27 Earpiece/Mic For Select Yaesu and Standard Horizon Radios Ear Bud with PTT Switch on wire. Fits Yaesu/ Vertex & Standard Waterproof Radios that use the MH-73A4B, MH-57A4B, VC-24, MH-66D4B or CMP-460A mics Fits Yaesu VX-6R, VX-7R, FT-270R, VX-170, FT-277R, VX-177. Fits Standard Horizon Models HX370, HX470, HX500, HX460 Also Fits Alinco Models DJ-G7T, DJ-V17T, DJ-V27T