Instruct: Classify a given Amazon review as either positive or negative.
Query: short of expectations

The Rio 600 was a bit of a disappointment. First of all, within a week or two, the supplied earplugs separated and the control pad used to play the songs became increasingly more difficult to depress. Getting a song to play was at times almost impossible. One thing that I really did not like was the inaccurate power monitor for the batteries. When the Rio said that I had < 4 hrs playing time, it would not play. According to the power monitor, the battery still had 1/3 of its power, but yet the Rio did not play. I must say that I have been dissappointed with the Rio. I would recommend the Rio as a[n]..alternative to people...