Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Flickering light is unacceptable

I received this light as a gift for Christmas. At first I thought it was a great present to go with my Kindle. However, the light seems to flicker anytime I move the head and I have to tap it in order for it to stay on. I've swapped out batteries and still had no luck. What a piece of junk.