Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't waste your money

Don't waste your money on this piece of crap. I bought two of these last year and they worked OK for the first winter. I unplugged them when winter was over and the following winter when the cats needed them, they didn't work. I think I read something similar in someone else's review but I decided to give them a try figuring that perhaps someone received a defective one. Both of the ones I bought failed. I wouldn't trust anything made by this company.