MUCH more effective than recorded white noise played back through pricey Bose speakers.
Will not cut loud high-pitched noises (e.g. people screaming right outside the door); or speaker-amplified noise from very close by (e.g. downstairs neighbor with his electric guitar).  But anything short of those -- yippy dogs, TV, street noise -- takes care of.<br /><br />Solidly made, simple to use.
Rating: 5 stars