Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Doesn't Work, Don't Buy

This product has never worked as promised. I bought it for my grandson, and he has beeb sorely disappointed. I thought the first one was damaged, so bought a second one, throwing good money after bad. The second performed as poorly as the first. The supposed "turning" of the crystal producing the rainbow effect has never occurred in either of the two. There has never been a rainbow. I would actually rate this Zero stars. Save your money, don't buy this product.