Briggs & Stratton 40233 12,000-Watt Bi-Fuel Standby Generator with 100 Amp Transfer Switch 12,000-watt bi-fuel standby generator powered by a Briggs & Stratton 627cc Vanguard engine 100 Amp manual transfer switch for ready-to-go power Enough power to run 4-ton central air conditioner Computer-friendly internal voltage regulator protects sensitive electronic equipment Measures 48-by-33-by-30-1/2 inches (LxWxH); weighs 442-1/2 pounds; 4-year warranty