First Alert Carbon Monoxide Detector, Plug-In Alarm with Test & Silence Button, CO600, White, 1-Pack

I ordered this as a replacement for the exact same product. It produced the ‘end of life’ warning seven years after installation almost to the day. I never had an issue with false readings, and when I had my furnace serviced, I had the tech check for built up fumes to see if the sensor had missed a build up, and it was not misreading. The plug in feature is great…no need to replace batteries!

Must recommended for your residence! Will last about five years! Easy to install.

Since most of the major appliances, stove, heater, water heater etc in my home are powered by natural gas I decided CO alarms would be a good Idea. This alarm has a small form factor so it does not take up all the space of the electric socket, you will still be able to use the top plug. Its a plug and play application. Plug it in run the test and you are good to go. Although small the alarm has a loud warning alarm in case CO is detected. I haven't experienced any false alarms or weird behavior from the alarm and so far is has worked well.The US Consumer Product Safety Commission recommends buying and installing a CO alarm that meets the requirements of the current UL 2034 safety standard. I saw a review here stating that this alarm was not UL 2034 certified, which is not true. The CO600 is UL2034 certified.Underwriters Laboratories Inc. UL2034 defines three specific alarm points by whichall residential CO alarms must alarm. They are measured in parts per million (ppm) of CO over time (in minutes).UL2034 Required Alarm Points:* If the alarm is exposed to 400 ppm of CO, IT MUST ALARM BETWEEN 4 and 15MINUTES.* If the alarm is exposed to 150 ppm of CO, IT MUST ALARM BETWEEN 10 and 50MINUTES.* If the alarm is exposed to 70 ppm of CO, IT MUST ALARM BETWEEN 60 and 240MINUTES.The detector must ignore CO levels of 30 ppm or less for at least 30 days and ingore levels of 70 ppm or less for at least an hour. There are detectors available that will alarm at a lower level. All detectors must have a silence button. Pushing it will silence the alarm for four to six minutes. If the concentrations stay above 70 PPM it will alarm again in six minutes. (Previously set at 100 PPM) The detectors have only two alarms, a full alarm and a trouble alarm. The second revision of UL-2034 detectors allowed (not mandated) warning alarms that sounded at low levels. Some found this confusing.Detectors manufactured under the new standard should reduce the number of nuisance alarms. These detectors must not alarm in the presence of the gases listed in the following table below the indicated level.Methane 500 PPMButane 300 PPMHeptane 500 PPMEthyl Acetate 200 PPMIsopropyl Alcohol 200 PPMCarbon Dioxide (CO2) 5,000 PPMMore info on UL-2034 can be found on Underwriters Laboratories website ul.comIf the device starts to malfunction/ give false alarms I will update my review.

We had a unit very similar to this that finally reached the end of its life and started the death beeping. I thought I was replacing it exactly when I purchased this one online but to my dismay I discovered that it does not have a battery backup. It is electric only and while it works very well at least the test button gave the desired signal, I'm kind of sorry it didn't have the battery in it in case the power would be out. But then I thought about that a little bit and if the power is out well the furnace is not going to be running so how could we get carbon monoxide in the house? Anyway I kept it plugged in in the hallway and hopefully it will do a fine job for us for the next 6 years. Seems like a good unit for the money just be aware there's no battery backup.

Easy to plug in and good to have the peace of mind knowing it’s there. Our previous alarm got to end of life and started beeping - I would appreciate a little more clarity which beeps are end of life and which beeps are the alarm!

EXPENSIVE, BUT WORTH IT....HAD 3 YEARS ALREADY & NO ISSUES.

There's little more to this than testing and just plugging it in, and it brings peace of mind to know it's there in case of any carbon monoxide issue, especially during the winter months.

Seems to be working great! Nobody's died yet! Peace of mind at a great price.

Shipped quickly. Ordered to replace an existing unit that had expired, so I already know what to expect from it. Good product.

Carbon monoxide detection.Easy to install

Received the alarm and it is as described however there I see a date on the back and it wasn't clear if it is an expiration date or a manufacturing date.

Works Great

Plug and play. Easy to remove from package (which is 100% recycleable!), easy to install (although there is some discussion that since CO is lighter than air it might be better to go with a combination smoke/CO detector locared on the ceiling over a plug-in ...although I think it's better to have either one than none)