Bests & Worsts Reviews from Amazon

This Alarm is a “Photoelectric” plus carbon monoxide which is a good thing. I would only use a Photolelectric or Dual sensor , “Photo / ION” . This is regardless of the Carbon monoxide sensor capabilities. Do not rely on an “Ion” alarm to warn you of smoldering or smoke until it’s a breathing and moving fire. In other words , if you wait until it senses heat/fire, the smoke may have rendered you incapacitated, and it won’t help at that point. This detects “Smoke” and carbon monoxide, which is in my opinion the safer and gives you ample warning. check you tube or with the fire departments to make your own choice. Living in Florida we occasionally run a generator following Hurricanes and Tropical storms, so it’s a must to have the carbon monoxide feature. I tested both alarms myself with a smoke bucket, I was never able to trigger the ION alarm with smoke only in my test. Watch a few YouTube videos on the difference in alarm sensors. ....1 year update,, no quality issues what so ever, and I own 4 of these. The only occasional announce is that if my bathroom door is open following a steamy shower, this detector is near within a few feet of the bathroom door, and will trigger a brief alarm. This only happens if we forget to run the exhaust fan in the bathroom. To be honest I’m okay with this occasional annoyance reminds me how well it works. Over cooking has only caused a false alarm when we burnt a bag of popcorn in the microwave so it’s a good balance of sensitivity.