First Alert CO615 Dual-Power Plug-In Carbon Monoxide Detector with Battery Backup and Digital Display, White

Review: Excellent Review Excellent Report with no problems! Al Thomas, MD

Good price for the pkg of three. Haven't had any problems with them yet. Easy set up, just plug in.

Protection devices need to inspire confidence. First Alert is a trustworthy brand, and this detector feels well made. It is important to read the instructions. It will alert you if you fail to properly insert the backup battery. We purchased it because to take on vacation to Panama, where we rented an Air BnB for two weeks. CO detectors are not required in some countries, heating and cooking devices may not be properly vented, and chose to be safe. * Although there was no gas heat where we stayed, we noticed that the gas for the stove did not seem to be odorized. A methane detector might also be useful.

I think the First Alert Co615 carbon monoxide alarm is an excellent product. I would have given it 5 stars instead of 4, except for the fresh-dating issue. I bought two of these carbon monoxide detectors from Amazon two years ago, in April, 2010. I like the following features: - It is powered by plugging it in, with a battery backup. So, it does not use the batteries much, but it will still operate if there is a power failure. And the batteries are two AA's, so they are not expensive. - No false alarms. I don't want to lose a night's sleep for no reason! - The batteries are not depleted as long as the unit has AC power. In two years, there is no noticeable drop in battery voltage. Therefore, I am not awakened by low-battery warnings, like the purchasers of some other brands. - Digital readout. You can press the button and see the reading at any time. Mine have always been zero; if I saw anything else, I would look for furnace, water heater, stove, or other appliance malfunctions. Some people have complained that it does not display the reading constantly, without pressing a button; I suspect this would drain the batteries more quickly in case of a power outage. - Detachable plug with extension cord. You can plug in the unit at ground level and install it much higher, so you can read it easily, and also have the unit sense readings higher off the ground. (Carbon monoxide is just slightly lighter than air.) I decided to purchase a third detector from Amazon. But when I put in the search criteria "Co615" with an "All Departments" search, a little note was displayed with a date of "May 2, 2007". I e-mailed Amazon customer service to find out if this was the date of manufacture, and they confirmed it was. This date is unacceptable. The detectors have chemical components that deteriorate over time, even if the unit is not turned on, and this date is FIVE YEARS AGO. I decided to purchase my third unit from First Alert directly in order to get a fresher unit. If I had received an older unit, it still would have been warranted by First Alert for seven years from date of purchase. However, I did not want to buy an item that had an increased chance of failing prematurely. I think both First Alert and Amazon can do better on the fresh-dating issue. First Alert should put the date of manufacture where it can be seen without opening the package. Right now, it is only on the unit, and you have to open the package and remove the plug to see it. Amazon only displays the mysterious date (which happens to be the manufacture date) on the "All Departments" search result screen. It does not appear in the detailed description of the item. It also does not appear if you search within a particular department, like "Tools and Home Improvement". This date is important, and it should not appear only intermittently and without explanation.

Received my new CO615 and installed it. Watched a video for the install and test. Much easier than trying to read the tiny print on the instructions. Also found the MFG date. Important because it stated a 7-year life product. My only drawback is that it isn't very well lit when plugged in, but that makes sense, so you don't run the battery down. Having said that, not sure if the batteries are being used when plugged into an outlet? TESTED it, all worked well. INFO: UPDATE: Found info behind the plug, remove the plug from the back clips. Marking “2025 OCT 31 L-22” means: 2025 OCT 31 → The unit was manufactured on October 31, 2025. L-22 → This is a lot or production line code used internally by First Alert. It helps them track batches, but it isn’t something you need for everyday use. Stay Safe

Easy to install and replaced older model. Question though is can the plug in cord be removed. Since there is no back on the unit, I had to use electrical tape to secure cord in unit. I could find no reference to the corded plug in in the manual. Thanks

This is my favorite CO detector. AC plug in with battery backup from 2 x AA cells; AA batteries are less expensive than the 9 V batteries other detectors use for backup. Also I like that this has a display so I can get an indication of the level of CO, if it ever alarms.

Works very well. No issues. Noise level very loud.

These are great monitors. They came highly recommended by my fire department nearby. This 3pk. buy worked great because of the size of home, the people I was buying it for.

utterly useless, sold on amazon as a plug in alarm suitable for U.K market, plug in not compatible with british wall sockets. needs returning to the U.S.A.

It arrived ahead of estimated arrival. It was well packaged and protected. This item comes very highly rated and hasn't disappointed yet.eg false alarms; dead batteries. Peace of mind at a fair price.

I've had this for several years now and still working well.

I own a condo townhouse and on the 24th of December 2022 the fire man came to my door after they were called to my area by another home owner whose carbon monoxide was going off. The outlet to my outside gas furnace pipe was blocked with snow. They cleared the snow away checked my monoxide fixtures and told me I need all new ones. I bought the package of 3 as the picture shows and plugged them in. They have a small light that shows they are on and working. I strongly suggest that anyone who does not have carbon monoxide alarms buy a package of these immediately. You can test them just by pressing a small button. Again, I repeat again if you do not have carbon monoxide alarms in your dwelling get these. They work great.