Dura heat, 13,500-18,000 btu, portable 360 degree double tank propane lp heater, gray/green, piezo ignition, heats in a 360 degree radius, built in oxygen depletion sensor, safety tip over shut off, protective grill guard, single 1 button lighting/heat control, swivel valve for easy loading, utilizes 2 disposable 1 lb propane bottles, built in carry handle for easy mobility, 450 sqft, outdoor & indoor options.