Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Piece of Junk!

I received this product directly from Amazon NIB. I found the product very comfortable but the sound quality was horrible. People complained that my voice sounded muffled and I could not always understand or hear the party on the other end of the line. Within the first few days, the volume button stopped working as well.I have used the Jawbone in the past (til I lost it) and found the sound quality to be very good, but it was very uncomfortable to me. As a result, I was exteremely pleased at the comfort, but later disappointed with the quality.