AD-1-KM AD1KM Original Heil Sound Kenwood 8-Pin Modular with Mono 1/4 inch Female Jack for PTT Headset Boom-Microphone Adapter Cable NOTE: The 1/4 in. stereo male plug on your headset cable does not connect to the AD-1 series cables, but connects directly to your transceiver headphone jack. All Heil Headset Adapter Cables use commercial-grade microphone connectors with dual-exit cable clamps that are much heavier than the normal CB-type connectors that the industry had been forced to use for decades. If you have several brands of transceivers, individual adapter cables may be connected to each radio, so you may quickly and easily move your Heil boom microphone headset from one transceiver to another, without having to remove any connectors from the transceivers. All Heil audio cables are wired through to support VOX operation. Heil Sound Headset Adapter Cables are available in 4-pin and 8-pin round connectors, and 6-pin and 8-pin modular-style connectors. HSTA series Headset Adapter Cables were specially designed for the legacy Heil TRAVELER Headsets that were discontinued and are no longer available. Some of the presently available adapter cables feature an extra wire and connector to go to the transceiver external speaker connector, for those radios where receive audio is not provided on the microphone connector. On transceivers that support them, the special UP-DOWN buttons on the TRAVELER Headset cables are connected with these cables.