Generac 6461 Guardian Series, 16kW Air Cooled Standby Generator, Natural Gas/Liquid Propane Powered, Steel Enclosed, with 16 Circuit 100-Amp Prewired EZ Automatic Transfer Switch Runs on Natural Gas or Liquid Propane and features hands-free operation with no manual start, no fueling, and no extension cords True Power Technology provides safe, clean and smooth operation of sensitive electronics Includes 100-Amp 16 Circuit Prewired EZ Automatic Transfer Switch UL, CUL, and EPA Compliant for Safety 5-Year, Limited Warranty