Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not a good laser pointer

It's always a problem when use it as a laser pointer. I got it in September and used only once for lecture (80 min). The second time, the laser pointer did not function, no lasing! I requested for an exchange from Amazon that responded quickly. For the second piece, I used about 5 times, and then the laser does not lase. It sucks. I do not know how to do with it. Further exchange or request for refunds? I have already discarded the package. Headache.