The new 30 Amp Surge Guard Portable RV Power Protection with Diagnostics, Model 44280, is perfect for pop-ups and travel trailers. It identifies faulty park power, offers surge protection, and analyzes circuits to verify pedestal power. Indicators illuminate to show power status and over heat conditions. Tests for and indicates Open Neutral, Open Ground, Reverse Neutral, Reverse Ground, and Open Circuit. 2,100 Joules of Power Surge Protection!