I recently developed tinnitus and couldn't sleep as the noise in my ear was intermittent and driving me crazy. I looked at expensive sound machines but was wary of being able to sleep with the sounds they had to offer. This machine is great! It sounds like wind rushing though, sort of like a vaporizer running. The only reason why I didn't give it 5 stars was because there wasn't that much difference in the sound when I moved the dial which opens and closes the air holes. It's definitely "white noise" and I would definitely recommend this product.