Generac’S GP6500 Portable Generator With CO-Sense™ Technology Provides Lots Of Power While Protecting You and Your Home From Carbon Monoxide (CO) Poisoning. If You Inadvertently Use The GP6500 Indoors or In An Enclosed Space, CO-Sense Will Automatically Shut Off Your Unit When Increased CO Is Detected. This Unit Also Offers Powerrush™ Advanced Technology, Which Delivers More Than A 40% Increased Starting Capacity. Generac’S Ohv Engine and Large-Capacity Steel Fuel Tank Ensures Long Engine Life and Run Time