This is the WCS3000 commercial 2500 watt generator that is designed with a gas-powered GX160 engine that features a high capacity fuel tank (18L),(2) 20A, (1) 30A. This unit features a recoil start and does not require a battery for operation. Run time is 12.5 - 16.6 hours with a decibel rating at 23 feet :68.