Introducing the World's Only "All-in-One" RV Power Solution. The legendary, original, and patented RV voltage booster, now with the world's most advanced surge protection. The all new Hughes Autoformer Booster with Surge Protection has the same performance and reliability of the Hughes Autoformer Voltage Booster now with advanced surge protection in one package. The surge / spike protection unit is also replaceable. In the event of a massive spike, the surge unit will take the hit ensuring your booster and more importantly, your RV stays safe. Installs into your RV electrical system (with the optional internal mounting installation kit sold separately) or plugs into the park's power pole. The Hughes Autoformer is the only U.S patented Voltage boosting solution available today. All others are imitations.