Vertex Speaker Mic's

Vertex MH-45B4B HD Noise Cancelling Speaker MicrophoneHeavy-Duty  Noise Canceling Public Safety External Speaker Microphone with volume switch.  Suits Vertex Models: VX351, VX354, VX359, VX451, VX454, VX459, EVX531, EVX534, EVX539, VX426 & VX456  ..