This item makes a high pitched noise. It'a not loud, but it's at a frequency that makes it audible over everything else. It can't be drowned out or ignored. It was really hard to track down what was making it, especially since who would suspect it was this? For awhile I even questioned whether I was imagining the noise but I'd only hear it in the room this item was in. Anyway, once I unplugged, the noise was gone. Plug it back in, the noise is instantly back.
Anyway, very, very annoying. I had to throw it out. I can't live with that sound in my home.