I bought this adapter so that I could use my portable air compressor in my house. It does not work with my compressor. It is useless to me. Since the time that I wrote the preceeding three sentences, I have found a use for this item. I can use my cell phone's car charger in the house with it. It came in handy for a friend of mine who lost his regular AC charger. I am changing my rating from one star to two.