OBSERVER™ Series SPEAKER MICROPHONES with QD® (Quick Disconnect) Radio Adapter. Push-pull mechanism locks the Mic to the Radio Adapter but is also easy to release. Includes 3.5mm earphone jack for listen only.
Fits older Vertex radios with multi-pin connector (note: NOT compatible with VX-537 or NYPD models) including: VX-310, VX-500, VX-510, VX-520, and VX-520UD.