Bests & Worsts Reviews from Amazon

We bought this carbon monoxide monitor as we are renovating an older house and have aging appliances not yet replaced. The monitor arrived in a timely manner and it was easy to install the back up battery. After reading other reviews I checked the date on our unit and it was made just a few months ago. It came with good and easy to follow instructions. The plug and cord are neatly house at the back of the unit, so if you have a close electrical outlet you can just plug it in. If not, the cord unravels and you can plug it in further away from the appliances. (just don't have it too far away or it may not be as effective in the case of a CO leak). We have had the unit for a few weeks now and it has constantly measured "0" (parts per million - ppm). Because the unit doesn't alarm for readings below 35 ppm, there is a button you can press to check if there have been any lower-level readings detected. Again, for us, when we checked through this function it also always read "0". We finally asked ourselves......does this unit even work?!! Well we found a way to check it out, and indeed, the unit does work very well. My husband took the unit to the garage, and then drove our car into the garage, turned off the engine and shut the door down. He waited a minute or less and the unit indeed detected a small amount of CO (15ppm - see picture). Because it was under 35 ppm, the unit did not alarm, but at least we now know it really does work. I would never suggest you try to check your unit by running your car in a closed garage. We were just measuring the fumes from an engine that was switched off, just as if you came home, parked and turned off your car, got out and shut the garage door. We are very happy with how the Kiddie Nighthawk CO detector works and are very glad to have it in our home - great peace of mind from a great product that we wouldn't hesitate to recommend to others.