Covert Acoustic Air Tube Earpiece. For EVX-531, EVX-534, EVX-539, VX-231, VX-241, VX-261, VX -264, VX-451, VX-454, VX-459, VX-420A VX-110, VX-130, VX-131, VX-132, VX150, VX-160 VX-168 VX-180 VX-210 VX210A VX-228 VX-230 VX-231 VX-298 VX-350 VX-351 VX-354 VX-418 VX-400, VX-410, VX-420,VX-428 VX-429 VX-450 .
eBay