This unit was acquired in wooden case and has never been used. It requires a MIL-DTL-5015 4 pin female plug to operate (not included). I believe a Amphenol or MILNET (MS3108 ?) four pin plug will work. This unit was made to connect to tents and used in military trucks. Any visible scratches or marks are the result of being moved around in my garage. Complete manual is included. A discussion on the unit can be found on steelsoldiers . com under U.S. Military 6,000 BTU Air Conditioner
/u-s-military-6-000-btu-air-conditioner.36556/