I bought this recently, I wanted cleaner air and white noise in my bedroom. There are three levels, the first two are like a whisper, can't hear them, and then level 3 is like a loud fan. It's odd how much of a jump there is between levels. Since the third level is so loud, I can't sleep with that on, so this doesn't really do what I want as far as to make white noise. Pretty disappointing, I may return it.