The Dual-Mode Generator allows you the flexibility to get immediate backup power now (when you need it most) and permanently installed backup power later - all in one compact unit. Engine: Briggs and Stratton, Rated Watts LP (kW): 7,000, Rated Watts NG (kW): 6,000, Surge Watts LP (kW): 10,500, Surge Watts NG (kW): 9,000, Volts: 120/240, Phase: Single, Fuel Type: Liquid Propane, Natural Gas, Enclosure: Yes, Battery Required: Yes, Battery Included: Yes, Dimensions L x W x H (in.): 30 1/2 x 22 1/2 x 32 1/2