KiddeKN-COEG-3 Nighthawk Plug-in Carbon Monoxide and Explosive Gas Alarm with Battery Backup (Pack of 3), 3 pounds

I have no way of rating the effectiveness of this product. If in the future I have a gas leak or CO event that this does not detect, maybe you can read about it in the news. I must rely on consumer testing groups. I rate the seller quite highly.

I was able to plug these straight into a outlet throughout my house and I can easily see the display when I check walk past them.

High quality product

This product is difficult to review unless it does its job. And, if it does it’s job, it will be either perfect, or too late. I do, however, feel safer with it installed, and for that reason I’m giving it 3 stars.

have these in all my rental cabins

Buy it ! something goes wrong you will be happy u bought them

Safe and easy to install

I can't talk of the accuracy or quickness of the units to detect a leak because we haven't had one. But after a prolonged power outage (~14 hours), I can say that the battery backup of these units is horrible. They take a 9 volt battery as a backup. About 3 hours into our power outage, all 3 start beeping and displaying low battery indicator. I replaced 2 with fresh 9 volt energizer batteries and 6 hours latter both started beeping again with the low battery indicator. I checked both sets with a battery tester, and both showed about 75% charge remaining. I finally just unplugged them all. Luckily we didn't need them that night. I wouldn't buy them again.