[ WIDE APPLICATION ] The adapter is built with copper wiring coated that bends without breaking, ensures pressure-proof in the temperature range from 14~140°F, making it fits for Heavy-duty and different weather situations. Great for Marine, Recreational Vehicle camping, shore power inlet on the pedestal. [ THOUGHTFUL DESIGN ] The color yellow and the LED Power light indicator make it easier for users to see the adapter and the signal immediately, allowing you to spot it even if it's dark.