Briggs & Stratton 7,000 Watt Automatic Home Standby System with 50 amp (12 breaker) transfer switch Fully Automatic Operation: Starts Automatically whether home or away in the event of a power interruption to your home. Weekly exerciser keeps unit in top operating condition. Uninterrupted Run Time: Permanent connection to Natural Gas (NG, 5-7inch WC) or Liguid Propane (LP, 11-14 inch WC) provides continuous operation. Briggs & Stratton Intek: Premium commercial-quality engine specifically designed for long lasting, reliable operation Quiet Operation: A Lo-Tone Muffler and Sound Absorbing Panels provide neighbor-friendly operation. Sound level 77db Non-CARB Compliant/Not For Sale In California