First Alert Carbon Monoxide Detector Alarm | Plug-In with Battery Backup, CO605

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.

Recently our neighbors had an incident where a CO detector went off in the middle of the night and perhaps saved their lives. It reminded me that our old detector (Kidde Nighthawk) had eventually got to the end of its life and we had to throw it out and we had not replaced it. So we looked for a replacement that we could put up easily in a good location. How do you judge a CO detector? I searched online and checked out reviews of those that actually test these things with Carbon Monoxide and found that the First Alert was frequently rated better than the other brands. I wanted one that had both AC power and a battery backup and this one fit the bill. Here's what I like: After opening it up and popping in the included batteries, it was ready to go! The attached plug and cord are designed so that you can install it directly into an outlet or hang it somewhere else and run the cord to the outlet. But since Carbon Monoxide sinks, plugging it in at wall outlet height just makes sense (It can also be rotated 90 degrees in the outlet to make more room). You really don't even need to look at the instruction manual because it is so easy! People make a big deal about the lighting, etc. on the digital display, but here is the thing to know: The displays on these CO detectors generally do not display anything until the level reaches 30 ppm (even the ones with the always-on red digital display). Anything under 30 ppm and it simply says 0. So the only reason you need the display is if the alarm actually goes off. At that point the LCD flashes red and the number is displayed so that you can report it. I also like that this unit will keep the number in memory for 24 hours (after all, who of us will remember the number if the alarm is going off at 2:00 AM and you are calling 911?). The rest of the time, all you have to do is look at it and there is a small green led indicating that things are ok. Peace of mind!

We've been in our house for 20 years and frankly these sorts of devices simply wear out over time. They are must have to keep your family safe and I've used this brand consistently and it works great.

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

The inclusion of a 9V battery right out of the box is a thoughtful touch. It gives me peace of mind knowing that the detector is ready to go, and the added battery backup ensures continuous protection even during power outages. I tested the detector when it arrived, and everything checked out. The ease of setup and the immediate functionality straight out of the box impressed me. The clear instructions provided made the installation process a breeze. As a consumer, the First Alert brand has always been synonymous with reliability and trust. This CO detector is no exception. It reinforces my confidence in the brand, and I appreciate the commitment to delivering high-quality products that prioritize safety... at a reasonable price. The white design seamlessly blends with my home decor, making it unobtrusive. The compact size ensures it doesn't take up much space. In summary, the First Alert CO605 Carbon Monoxide Detector is a stellar product that offers peace of mind, reliability, and ease of use. I highly recommend it to anyone in need of a top-notch carbon monoxide detector. Five stars – well deserved!