Instruct: Classify a given review as either positive or negative.
Query: Kidde CO and Gas alarm

I had this unit for 3.5 years. (Years of false explosive gas alarms). The first year went well, the second year was worse and so on. By year three the random gas alarms were highly frustrating and expensive in time and money. Finally I sealed the unit in a plastic zip lock bag, with a new battery, and plugged it back into the wall as a test. Same random alarms while completely sealed from the environment. Bottom line is this unit is junk and Kidde should refund every purchaser for the expense, time, and loss of hearing.I just pulled this unit off the wall and smashed it with a sledge hammer, and it finally made a noise I really liked! If I could give it a -5 stars I would. Don't waste your money on this junk.