This is a hardwired electrical management system (EMS) surge protector which provides full RV protection against all adverse power conditions. It features multi-mode surge, voltage, polarity, and lost/open neutral protection. Each unit includes a digital display, scrolling continuously through the power source information: Voltage(s), current, frequency, error code, and previous error code (if applicable). Replacement parts are simply plug-and-play, making repairs quick and easy. The computer is driven by state-of-the-art microprocessors. - Over/Under Voltage Protection - Open Ground, Open Neutral and Reverse Polarity Detection - Accidental 240V Protection - Miswired Pedestal Indication - Surge Failure Indicator - Amperage Meter Display - Previous Error Code - A/C Frequency Protection - Time Delay (136 seconds) - Adjustable Time Delay - Thermally Protected - Built-in Scrolling Digital Display - Field Serviceable Warning: Product may contain materials cautioned by California Proposition 65