Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Constant False Alarms!

I have two of these alarms in my house. After two years of working ok, one of them started alarming with the CO chirps. After pulling it from the main voltage source and disconnecting the battery, I re-installed the battery and put it in every room of the house to see if the CO alarm would go off again, and it DID! Assuming it was defective, I replaced it with another one. A week later, the other one in the house started doing the same thing, a false CO alarm. I was told this one has turned defective as well. I think the company wants everyone to spend at least $100 per year on purchasing these poorly designed alarms.....enough!!