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Progressive Industries Smart Surge Protectors SSP are portable RV surge protectors with the added benefit of a built-in polarity tester. The built-in surge indicator notes the condition of the surge protector. Additionally the polarity tester checks the status of the power source prior to use. Sleek compact portable design makes this unit easy to use and store. Engineered for weather resistance to stand up to the elements. No installation required. Sleek compact portable design makes unit easy to use and store. Plug-and-play application. Designed for recreational vehicle use only. This device has operating temperatures of minus 40C to over 105C.