The 4000 W portable gas generator is powered by a 223cc engine with low oil shut off which protects the engine from damage. CO protect technology automatically shuts down the generator if carbon monoxide levels become unsafe or rapidly increase. This generator is equipped with covered outlets to help protect it from even the toughest jobsites and features heavy-duty wheels for transportation and durability. The 3.4 gal steel fuel tank provides up to 10 hours of runtime at 50% load. The 1-1/4 in steel tube frame helps protect it from jobsite conditions.