Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Product does not work right.

This product only really works when you are really drinking. When I had a beer and tested it by the book it did not register. I owned a AlcoHawk slim which was much cheaper and would at least register when you had less to drink. I am not satisfied at all with the product and am sending it in to get calibrated new out of the box. I would not recommend this product and learned the hard way.