Guardian Series 16,000 watt standby generator for whole house protection. Features a 200 amp, NEMA (National Electrical Manufacturer's Association) 3R (aluminum outdoor enclosure) smart transfer switch. True Power technology provides power quality with less than 5 percent total harmonic distortion for clean, smooth operation of sensitive electronics and appliances. Runs on a G-Force engine built specifically for generator use for reliable power and requires less routine maintenance. Natural gas or LP (liquefied petroleum) gas operation, direct-to-dirt composite mounting pad, sound attenuated enclosure, and electronic governor. Quiet-Test self-test mode runs at a lower RPM (revolutions per minute) for a 5 or 12 minute test. RhinoCoat powder-coated corrosion resistant aluminum ideal for all weather conditions. Can be installed within 18 inches of a building. Evolution controller features a multilingual LCD (liquid crystal display) that allows the user to monitor battery status and track maintenance intervals. Low oil shutdown and overload protection. CARB (California Air Resourcing Board) compliant. GENERATORS ARE NONRETURNABLE.