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Portable RV surge protectors with the added benefit of a built-in polarity tester. The bult-in surge indicator notes the condition of the surge protector. Additionally, the polarity tester (dual line for 50 amp) checks the status of the power source prior to use. Units are sleek, compact and the portable design makes them easy to use and store. Designed for outdoor use. Open Ground, Open Neutral & Reverse Polarity DetectionMis-wired pedestal indicationSurge failure indicatorThermally protectedBrighter 3-color LED indicatorsRugged pull handleWeather resistant/ outdoor useNo installation required7-days a week customer serviceLifetime warranty