The sounds made by this machine are soothing and not at all annoying or intrusive. There is no vibration or whine, and it doesn't hum. It is just pure white noise, like rushing air. It works pretty well in drowning out normal neighborhood noises, and you can set it on low or high, and also adjust the "tone" of the white noise as you wish. Unfortunately, it was not loud enough for my purposes. I bought it hoping to drown out the sound of the jet planes which, when the wind is right, zoom over my house half the night at something like 17,000 feet. I guess that was too much to expect from any machine, because the only thing that's going to drown out an A320 is another A320. However, I am glad I bought it, and I do use it on a regular basis to drown out ordinary noises. It works very well for that.
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