Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Defective Wave Ceptor

I have had one for 3-4 years and it works very well.So I bought one for my son's birthday. It was delivered by Chelsea Watch co. It is defective. The hands don't move or when they move they don't show the correct time. (The digital display functions properly.)I have a hard time getting a return address from Chelsea, so that I can have it exchanged before the 30 day limit expires. (Forget about meeting the birthday date.)Zoltan. J. Janosi