"Ideal for applications that require ultra-quiet operation and exceptional fuel economy. Achieves greater power output with less effort, resulting in significantly reduced fuel consumption both during exercise and under full load. Features aluminum enclosures for extra corrosion protection in coastal areas. Runs on natural gas or LP gas. UL listed. RTS transfer switch sold separately. U.S.A. Not intended for use as primary power in place of utility or in life-support applications. Read the owner's manual in its entirety before using this product. Phase 1, Battery Included No, Engine Displacement cc 2,400, Amps 112.5 NG/104.2 LP, Auto Shutdown Yes, Enclosure Aluminum, UL Listed Yes, Engine 2.4L 4-cylinder, in-line, Battery Required Yes, Start Type Automatic, Dimensions L x W x H in. 62.2 x 29 x 33.5, Rated Watts LP kW 27, Engine Cooling Liquid, Engine Speed RPM 1,800, Volts 120/240, Rated Watts NG kW 25, Rated Watts kW 27 LP/25 NG, Noise Level dB 70, Mounting Pad No, Fuel Type LP or NG. 27 kW liquid propane 25 kW natural gas Aluminum, corrosion-resistant enclosure Gray Quiet-Test feature for near-silent operation during self-testing 50 quieter than competitive models Generac industrial liquid-cooled in-line 4-cycle engine Automatic safety shutdowns and exerciser CARB compliant Standby generators require installation involving permanent outdoor placement, electrical wiring and fuel source connections. We recommend the use of a trained professional for final connections of gas and electric. Due to size of this generator, a crane or forklift is required for unloading."