Instruct: Classify Amazon reviews into positive or negative sentiment
Query: decent sound for $20 but bad build quality

I bought these because they were cheap and had the noise canceling feature. However, even with the noise-canceling feature on, there was still a bit of hiss. That would be acceptable, but in 6 weeks, I've had two different pairs short out. The right side shorted out on both of them, and will come on and off if you jiggle the cord JUST right. I will be returning these, AGAIN, and needless to say, not getting another pair.