Bests & Worsts Reviews from Amazon

I installed these last week. First time I have had smoke detectors with carbon monoxide detection as well. After functioning properly for a week they went off at 4 AM today. I shut them off manually and they went off again. I called the Fire Department who arrived with a hand held monoxide detector and confirmed that our boiler was malfunctioning and spewing lethal amounts of carbon monoxide. The gas company shut our boiler down and we are waiting for service. This saved our lives.