Cell phone plug with sub-mini plug tip, ring and sleeve. It is made to work with the CP-200, CP-201, CP-202 and CP-201A. It has a microphone with lapel clip and a polorized pin plug for the receiver.
It can also be made to use with the older cell phones that have a 3/32" jack.
It is recommended to use with a 125 ohm receiver (not included).