Heil AD-1-IC Headset Adapter W/Cap for IC use on Icom 8-pin. Headset boom-microphone adapter cable, Icom, 8-pin round, W/Mono 1/4 inch female jack for PTT.
AD-1 series cables are required for the Heil boom microphone headset model. Each has a female 1/4 in. mono dongle connector on a short wire for PTT keying foot switch or hand switch connection.
NOTE: The 1/4 inch stereo male plug on your headset cable does not connect to the AD-1 series cables, but connects directly to your transceiver headphone jack.