Generac Guardian Series 6051 10,000 Watt Air-Cooled Liquid Propane/Natural Gas Powered Standby Generator With Transfer Switch (Discontinued by Manufacturer) Automatic, hands - free backup power supply for home or business Kicks in within ten seconds of determining power loss so your life won&#65533;t miss a beat TruePower technology provides clean, smooth operation of sensitive electronics and appliances QuietTest mode for a weekly self-test that's quieter than other brands Non-CARB Compliant/Not For Sale In California