The Briggs & Stratton 040743 bundle includes the PowerProtect 13kW PP13 generator, 200 Amp automatic transfer switch, and Symphony Choice Power Management. The 13kW PP13 is an emergency standby generator that continues to supply electric power to your house during a grid power breakdown. It will run the air conditioner, home appliances and security system so you and your family stay safe and comfortable indoors. This Briggs & Stratton residential model runs quietly at 67 dBA and can be used for small and medium-sized homes. The Symphony Choice Power Management system lets you power only certain circuits or the whole house. Runs on LPG and natural gas and switching between fuels is easy with the flip of a switch. During storms, you can get an unlimited supply of fuel from the kitchen gas line, so you do not have to step out of the house during bad weather. The all-new NGMax technology allows you to get more power from natural gas compared to other models on the market.