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

The Bottom Line: This is a highly flexible carbon monoxide detector that solves the "blocked outlet" problem with its detachable cord, while providing a clear digital interface that makes monitoring straightforward. Installation & Setup: The "Dual-Power" claim isn’t just marketing; it makes installation incredibly versatile. You can plug it directly into a standard 120V outlet like a typical sensor, but the standout feature is the detachable plug. Using the included 6-foot power cord, I was able to mount the detector at eye level on the wall while plugging it into a lower outlet behind furniture. This is a huge win for accessibility and better airflow monitoring. Visibility & Interface: The backlit digital display is a major upgrade over standard "LED-only" models. It’s easy to read even in low light, displaying current CO levels and battery status at a glance. I particularly appreciate the "Peak Level" memory feature, which lets you see if any levels were detected while you were out. Safety & Reliability: Battery Backup: It uses 2 AA batteries (included), ensuring it keeps monitoring during power outages. Loud Alarm: The 85-decibel horn is piercing enough to wake you from a deep sleep or hear from another floor. Maintenance: The front-access battery door means I don't have to unplug or unmount the unit just to swap batteries. Pros: Detachable plug allows for wall mounting or direct plug-in. Clear, backlit digital display replaces confusing beep codes. Continuous monitoring with a reliable electrochemical sensor. Cons: The display does not stay lit constantly to save power, so you have to press a button to see it clearly in pitch black. Final Verdict: If you want a reliable CO detector that doesn't dictate exactly where it must be placed based on your outlet height, the First Alert CO615 is the best option in this price range.

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

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

Decent product. Consumer reports says this model detects carbon monoxide with an excellent rating. It plugs in and does not need any further stabilization beyond that. It comes with 2 AA batteries that are easily installed. There is a difficult to see green light that shows you the product is working. I had to unplug it a couple of times to convince myself it was on. If you press the button on the right you are shown a blue screen with the current carbon monoxide level which should read 0. The button on the left is a silence/ test button. I thought it always displayed CO level. It does not or I would have given it 5 stars.

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.

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

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

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 would have rated them three stars but one of the units was defective and returned. Batteries once inserted became very hot. Fortunate I noticed it before simply connecting and leaving it in wall outlet.

It is easy to install and will keep my family safe.