SAFETY FEATURES: Built-in Safety Fuel Shutoff, Oxygen Depletion System (ODS), Fire Detection System, Safety Tilt Shutoff, and Exterior Grate Guard to protect you and your family FULL COMFORT: Built-in Auto ignition and Thermostat Dial for added heat control. Molded handle for easier transporting. ADVANCED THERMOSTATIC TECHNOLOGY: The Thermostatic technology used in this heater is the most efficient in the industrial gas heating market, the versatility and reliability of the Flame King Heater have made it the heater of choice for many. LONG LASTING: Lasts up to 2 hours on a single 1 lb propane cylinder (not included) at a 10,000 BTU output. OXYGEN DEPLETION SYSTEM (ODS) is a low-oxygen level sensor that shuts off the gas supply to avoid the accumulation of toxic carbon monoxide in the environment. THIS HEATER IS SAFE -for indoor use in small recreational enclosures having means for providing combustion air and ventilation, such as enclosed porches, cabins, fishing huts, trailers