Mr. Heater Propane Space Heater 18,000 BTU Big Buddy Portable Radiant 450 sq ft- NEW IN BOX- With 8' propane hose and AC adapter.  I bought two of these and only need one.  I missed the return window.  My loss is your gain. 

Cold campsites and frozen lakes call for the warmth of a Portable Radiant Big Buddy Heater with Hose and Adapter. For your next excursion, the Big Buddy will keep you comfortable with up to 18,000 BTUs of heat. Swivel regulators make for easy setup–just screw on two 1-lb propane cylinders or connect to a 20-lb tank using the provided 5-foot propane hose. The 450 square feet of coverage makes any ice shanty a sauna and any deck a sunroom. Plug in the 6v AC power adapter to utilize the built-in fan and improve circulation. With the heaters Life Safety System, you won’t sweat too much knowing the oxygen depletion sensor, thermal shut-down system, and tip-over switch are keeping you safe. For all of your indoor and outdoor adventures, the Big Buddy is there for you.
Kit includes Big Buddy Heater, 8' propane hose, and 6v AC power adapter
Emits 4,000, 9,000 or 18,000 BTU/hr radiant heat
Designed and approved for indoor and outdoor use
Heats up to approximately 400 square feet