The GuardianPlus air-cooled generator is the industry's most cost-efficient pre-packaged permanently installed, automatic back-up power system. The system is designed to supply electricity to pre-selected emergency circuits (8, 10 or 12) that supply a home's essential items in the event of a utility power outage. The unit operates on either natural or LP gas. Installation has been made easier with the pre-packaged and pre-wired design.