The Champion Power Equipment 201161 12000Watt Tri-Fuel Portable Generator with CO Shield is designed with your safety and convenience in mind. The massive 717cc Milwaukee Series V-Twin Engine has all the power you need and more for home backup during an outage or your next project.The Fuel Select dial allows you to safely select gasoline, propane (LPG), or natural gas (NG) as your fuel source.Using natural gas, the generator produces 12,500 starting watts and 10,000 running watts. To connect this generator to your home's natural gas source, this generator includes a 25 ft. NG hose kit.Using gasoline, the generator produces 15,000 starting watts and 12,000 running watts, and will run for 9-hours at 50% load when the 11 Gal. fuel tank is full.When using a 20 lbs. propane tank, it produces 13,750 starting watts and 11,000 running watts, and will run for 3.5-hours at 50% load. A 6 ft. propane hose with a built-in regulator is included.CO Shield technology monitors the accumulation of carbon monoxide (CO), a poisonous gas produced by engine exhaust. If CO Shield detects unsafe elevated levels of CO gas, it automatically shuts off the engine. CO Shield is not a substitute for an indoor carbon monoxide alarm or for safe operation. DO NOT allow engine exhaust fumes to enter a confined area through windows, doors, vents or other openings. Generators must ALWAYS be used outdoors, far away from occupied buildings with engine exhaust pointed away from people and buildings.