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Works with ALL 30 Amp 3 Prong Twist Lock RV Power Cords. Twist lock design. Detects reversed polaritySoft glowing 'halo' light, if it is solid white, the wiring in the pedestal is correctEasy to read blinking Red/Green LED circuit lights. Green is good, if the letter is blinking red it means a fault is detected.Universal installation - no special tools are required. This works as a universal RV power inlet, available in both 30A and 50A versions.Water resistant cover. Nickel plated contacts