Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Multiple Problems

Functionality is good, but quality or quality control is very poor. Headphones were very poor, had bad tonal quality, and one buzzed irritatingly w/ resonances. Tone quality was good with quality headphones. Player exhibited extremely high noise levels while playing CDDA disks and right channel "chirping" noise during MP3 playback. Battery life seemed poor, although no quantitive measure was made. If you purchase this player, test it carefully before you throw away the packaging!