Compatible with Transceivers - FTM -10/FTM -10 H/FTM -10 S. With this adaptor you will be able to connect an external microphone to the front panel of the transceiver unit instead of the rear. This jack is used to connect an external microphones such as the MH -68 A6J and MH -68 B6J to the front of the Transceiver unit.