Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Can't truly give a review on the product, because I received a lemon

The shape & portability of this item seems reasonable, but I was upset having received a device that worked for only 1-2 days. Never worked since then. Changing batteries does diddly squat. Bought it from (what I thought was) a reputable seller...maybe I just received an unlucky item.