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MH-450S: Vertex Speaker Mic (shoulder microphones) with PTT and 3.5mm audio port. For use with Vertex 2-pin radios VX-231, VX-351, VX-354, VX-451, VX-454, VX-459, EVX-531, EVX-534, EVX-539.
Replacement for Vertex MH-450S, MH-360S or MH-45B4b microphone.