Instruct: Classify Amazon reviews into positive or negative sentiment
Query: COBY MP-CD521 Player

This is a terrible product. When you turn off the CD, you must disconnect the batteries or they run out. To disconnect the batteries, you must use a knife since they don't come out with just fingers. The CD skips at the least jostle (not even running). There is no warning that the batteries are running low. The CD just stops. When you turn the CD off, it will not resume at the same place if it is off for more than a few minutes, but goes back to the beginning. AWFUL.