Premium Acoustic Tube Earpiece, 1 Wire Braided Fiber Cloth In-Line Push-To-Talk & Mic. Works with Vertex Radio Models: VX10, VX130, VX160, VX180, VX210, VX210A, VX230, VX231, VX261, VX264, VX300, VX350, VX351, VX354, VX400, VX410, VX420, VX451, VX454, VX459, BC95, eVX-261, eVX531, eVX534, eVX539