Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Not what was expected...

The Koss earbuds I have had in the past were GREAT. They usually are plastic that fits in the ear and have great sound. THESE ARE NOT THAT KIND OF EARBUD!!! They have a foam outter layer that comes off really easily and it is difficult to get it back on if it comes off...also the sound quality was SOOOO horrible that if I was trying to listen to a song and walked by a car that was turned on...I could not hear any music because a car engine (not even reving) was louder than the sound these put out! DO NOT WASTE YOUR TIME WITH THEM!!!