Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Doesn't work at all!

I purchased 2 of these, one for myself, another for someone else. Turns out one of them only sort of worked, person on the other end of the line always said it was too quiet even though the volume was turned to the max setting. The other didn't work at all, maybe something wrong with the connection. Either way, don't waste your time.