Yaesu Vertex/Standard Horizon CT-91 Speaker Microphone Adapter Adapts single Speakermic jack into seperate speaker & mic jacks. Fits Yaesu VX-7R, VX-6R, FT-270R, FT-277R, VX-170, VX-177, VXA-710, VXA-330 Fits Standard HX-500S, HX-600, HX-370, HX-471, HX-270 Fits Radios Compatible with CMP-460A, MH-57A4B & MH-73 Speakermikes