BlackCat Perfectemp, Catalytic Heater, 3,000 BTU Output Operates Up To 7 HRS On One 16.4 OZ Propane Cylinder, Adjustable High/Low Temperature Setting, Compact Legs Integrate Into Collar For Easy Storage, Portable Easy To Grip Handle For Convenient Carrying, Provides Comfortable, Efficient Warmth Whether Outdoors Or In Spaces Like A Tent Or Home, Cylinder Not Included.