Check the listing for details. Used David Clark Helicopter headset w/ Oregon Aero upgrades (model unknown). Condition: Used. Listed at 120.00 USD. I bought this headset recently as a gift for my son who recently completed his private pilot license, not knowing that there was a difference between fixed wing & helicopter headsets. The headset has the Oregon Aero upgrade kit and is incredibly comfortable. The audio jack was tested & they sound great but the other plug was untested. I did not attempt to clean or alter them from the condition I received them so they could use a good cleaning but everything is in excellent condition with no visible damage. As the upgrade kit replaces the manufacturer label with the model number I am unsure what model they are, but if you know from the pictures I'd love to learn!Additional photos & info available upon request. Refunds are accepted if you are unsatisfied with them for any reason.