Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Tried one, returned it, tried another, returned it also.

I had the exact same problems with the second product product as I did with the first one Amazon shipped to me.It keeps intermittently making a harsh buzzing sound when it is turned on. How is this thing supposed to help someone sleep when it keeps making sounds akin to a blown stereo speaker? I would not recommend this product.