Total electrical protection from faulty park power for your RV. Easy to read, two-line plain English backlit LCD remote displayindicates the of source voltage, load current, or diagnostics. Protects from multi-mode surge suppression (fuse protected), low (<102V) and high (>132V) voltage, incorrectly wired pedestal and open neutral conditions. Offers 3350 joules of surge protection. UL Listed.