Tri-Fuel: 12,500/10,000-watt portable generator operates on natural gas, propane, or gasoline, plus natural gas and propane hoses are included so the unit is ready to run on any fuel right out of the box Electric Start: Power up the 500cc Champion engine with the handy rocker switch, battery included Intelligauge: Track voltage, frequency, session run time, and total run time to monitor output and track maintenance intervals, plus features CO Shield carbon monoxide auto shutoff system Powerful: Gasoline: 12,500 starting watts and 10,000 running watts, propane: 11,250 starting watts and 9000 running watts, natural gas: 10,000 starting watts and 8000 running watts and engine oil is included Champion Support: Includes 3-year limited warranty with FREE lifetime technical support from dedicated experts