It has a Advanced Products Corporation Battery Eliminator which supplies power to the headset with DC power input.
It was in a 28volt airplane but probably works on 14 volt also.The battery tray still accepts 2 AA batteries and the headset works fine .It was tested and the sound is good and the noise cancelling works good.
There is no cover for the battery compartment so is will have to be taped or rubber banded.
I have adjusted the price accordingly
. guaranteed to work or Return within 30 days for refund . Buyer pays return shipping.