Cord, CD-318-A by Walter L Schott Co. Extension cord used with the T-30 throatmicrophone. The microphone plug was inserted into the jack of the extenstion cord (JK-48). The cord has an inline 'push to talk' switch, SW141-AC, and a black PL-68 jackplug for connecting with the aircraft intercom. A cord was used to hang the extension cable around the airman's neck. Very good used condition. Stock code H18423.