Instruct: Classify Amazon reviews into positive or negative sentiment
Query: not so nice shock

The first few times I used this earphones, it was great. It is a little tricky getting them in just right (I had to switch to the smallest nubs; maybe it's easier for those with larger ears). Then while on a treadmill run, I felt a little snap in my ear. I didn't think anything of it. Sometimes the satellite reception isn't that great so I changed to another machine. I started running, and there it was again. There was no mistaking it, I was feeling little shocks in my ears. Well that was it for me. I definitely wanted these to work, so I was sad to have to return them. Maybe it was a bad pair, but I won't chance it.