There are some stains that couldn't be completely removed (maybe they'll come off with a melamine sponge?). It projects a beautiful aurora-like starry sky onto the ceiling (can move like waves or be stopped). I used it to help my children sleep when they were scared, but they don't need it anymore, so I'm selling it. Comes with a remote control. The main unit is rechargeable. Star Projector, Starlight Projector