I have 3 of these that's how great they are!
There is one in my sons room, my room and at my mothers house. This does a great job of drowning out noises from outside such as talking neighbors, car noises, dogs etc. it muffles theses sounds enough to not disturb the sleeper enough to wake up.  I cannot use any other sound to fall asleep to other than the white noise-fan sound. Love this product.
Rating: 5 stars