Instruct: Classify a given review into positive or negative sentiment.
Query: A great idea that, unfortunately, doesn't work

I thought this was the perfect solution to my problem, how to hear the front and back doorbells upstairs. I ordered two and installed them, neither one would work. OK, so I put the receiver in the same room as the transmitter, still wouldn't work.I called the manufacturer, the CSR was stumped; "You'll have to talk with Mike". I left Mike a message, he never called back. The vendor was unresponsive about an RMA, but Amazon finally set my account right.It would appear that they work for some people, but I think the likelihood that they will work for you is not high.