Instruct: Classify Amazon reviews into positive or negative sentiment
Query: don't buy it

I started having false alarms with this unit about 6 months after I bought it. The first time the explosive gas alarm went off in the middle of the night it freaked us all out. There were many false alarms until it finally got to the point where the alarm sounded constantly. I foolishly bought an identical unit to replace it, and that one had problems also.