The Model C3019B utility radio adapter provides interface between any David Clark series 3000 headset and a mobile radio system. This radio adapter is compatible with most mobile radios requiring amplified electret microphones*. The belt clip provides a convenient place for user's to access the push-to-talk (PTT) switch while allowing freedom of movement.The C3019B requires a technician to wire a cable to the back of the radio at its accessories connector and the other end connects to the panel mount connector. *In order to properly install this adapter, the following parts will be needed: (18352G-16) connector kit for bulkhead mounting, (09271P-34HA000) 6-conductor shielded cable (per foot) or equal, (13238P-01) protective cap (Optional).