They work right out of the box but my only gripe is that only the plug is UL listed. The original electrical cord and bracket that came with my salt lamps was also UL listed on the actual base. They look exactly like the ones that originally came with my salt lamps except for the UL approval on the base as I mentioned and a few different labels. They say they are listed for 75 watts as opposed to the 40 watts the original states. This is good news for me because I think salt lamps need to be hot to work as efficiently as possible and small 15 watt bulbs just can't handle that. the cords are nice too
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