Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Didn't last long

I checked reviews for monitors on every website I could find. This one seemed to have high ratings everywhere I looked, so it's what we got. We have a 2 story, so it seemed necessary to have two receivers. After 1 month, one of them stopped working. We did figure out that we could put a tiny nail in beside the volume dial and turn it up almost all the way, and it would sometimes work.Now, our baby is 5 months old and the other one is doing the very same thing. We are going to have to buy a new one because it goes out too much. I'll wake up in the middle of the night, and it's not working at all. We are extremely disappointed in it.