wire(I believe)that actually comes out of the wire bundle plug that connects the control head to the main body of the radio. I'm not at the boat right now so I can't be sure of the color of the wire but it's only about four inches long and the female jack is black. What I did was to make an extension lead that I plugged into the jack and hard wired it behind the bulkhead to another jack closer to my Pilot house helm seat so I can kick back and listen without the cord to the head set being to short.