Briggs & Stratton 40243 10,000 Watt EmPower Natural Gas/Liquid Propane Powered Air Cooled Home Standby Generator Generators have an automotive-style exhaust system and acoustic foam dampeners to ensure 50-percent quieter operation than most portable generators Air-cooled standby generator has advanced electronics to detect a power outage and automatically start the generator whether you are home or away 507Cc vanguard v-twin engine with a permanent connection to natural gas or propane gives performance requiring no messy gasoline storage and refueling Contemporary, space-saving design features steel enclosure features automotive paint for maximum durability and all-weather protection; CARB compliant Measures 31.6-inches in length by 30.6-inches in width by 34-inches in height; 3 year warranty