DEFENDER Series Single Wire TACTICAL KITS with D shape Earpiece and replaceable Radio Cable. Kit comes standard with PTT-1500B (Hockey Puck) PTT but can be upgraded ($35 list) to Belt-mount junction box and Finger PTT.
Fits older Vertex radios with multi-pin connector (note: NOT compatible with VX-537 or NYPD models) including: VX-310, VX-520, VX-520UD, VX-600, VX-800, VX-900.
