Shuts off when it detects power surges, open ground, open neutral, low or excessive voltage, miswired pedestals, or reverse polarity that could damage electronic equipment in your coach. Permanently installs within the bay of your coach, preventing potential theft and damage from the elements. Optional Remote LCD Display (#90197, sold separately) conveniently and remotely monitors RV electrical power ... Other features include: Automatic reset on power restoration. Multi-mode surge suppression. Automatically shuts off the power when the following is present: Open ground, Open neutral, Low (<102V) and High (>132V) Voltage, Miswired pedestal, Reverse polarity. Caution indicator light indicates: Elevated ground voltage, Surge failure indication. 128 second reset delay protects A/C compressor. 2450 Joules of power surge protection.