Instruct: Classify a given review into positive or negative sentiment.
Query: Great ear phones, until you go in an airplane!

We bought two sets last year for my kids. The quality and fit were perfect in our car. However, we took them on an airplane, and both sets quit working immediately. I didn't see where altitude was a problem anywhere, but apparently it is! Both sets quit permitting the lyrics of songs/movies to be heard, but you could still hear the music. I can't recommend buying this pair if their use is limited only to vehicles.