Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Can't use it due to continuous false alarms

I bought this because we bought a 50+ year old house that has had lots of upgrades over the years and I wasn't sure that I trusted everything was hooked up and vented correctly. I had hoped this would put my mind at ease but it gives constant false alarms about explosive gas and, sometimes, carbon monoxide. These false alarms made me worry so I bought a special, hand-held gas sensor to check every gas connection I could find and all fittings check out just fine. Don't know what to think at this point but I can't trust this sensor. This was a waste of $70. In the future I'm going with separate gas, carbon monoxide and smoke detectors.