Worked once on first connection upon receipt. It hasn't worked since then and I've tried it in several different outlets with different things plugged in. I've also tried replacing the battery to see if that was the problem and it still doesn't seem to want to work. Real shame, I wanted it to work. ๐คท๐ผโโ๏ธUpdate from 11/17/18 I was contacted right after the first review. They fixed the problem and immediately sent a replacement and now the switch works as it should!