5-Mode Surge Protection: Line 1 to neutral (L1-N), line 2 to neutral (L2-N), neutral to ground (N-G), line 1 to line 2 (L1-L2) and line to ground (L-G). 5000 Joules of surge suppressionSurge indicator lightVisible diagnostic lights to easily indicator wiring faultsAuto shut off/on: If input voltage goes outside the set voltage range, the circuit will be disconnected and when stabilized, the circuit will restore powerWeather resistant coverMetal locking ringWire brush included for brass prong maintenanceLimited lifetime warranty