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 RV220-50SP has the same performance and reliability of the RV220-50 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. Features50 Amp - 12,000 Watts capacityFully automatic 10% boost when neededComplete LED Park Power DiagnosticsBoost indicator light4800 Joules of Advanced Surge Protection Built-inReplaceable Surge Protection Unit- SKU: KSAO516487 This product ships in approximately 1 days