Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Only plays in MONO.

Sound is fairly good if you don't have lots of base or want stereo sound. I had to play with it quite a bit before I would get sound, but once I got it in there just right it was okay. And I tried it with multiple cassette players, in car stereos and in regular cassette players. I finally got something different, and wished I had got the better one sooner! What I ended up getting was the Xm Auto Cassette Adapter. It has stereo sound and you just stick it in and listen to whatever music you have. Whether it has lots of bass or not. This adapter is not worth a penny in my opinion!