Vertex/Standard (Otto) V4-10406, ClearTRAK behind the head. Heavy-duty headset with certified noise reduction rating(NRR) of 24dB. Built with an extreme noise-canceling microphone (3dB-Standard) (19dB-ClearTrak). PTT switch located on the earcup. Flexible, heavy-duty coil cord. For VX-210, VX-400, VX-131, VX-160, VX-180. List price $395.37
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