First Alert CO400 Carbon Monoxide (CO) Detector, Battery Operated Alarm, 1-Pack
$19.99
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The First Alert CO400 carbon monoxide alarm uses an electrochemical sensor the most accurate technology available. The permanent sensor lasts up to 5 years. It is powered by a 9V replaceable battery giving you peace of mind even during power outages. The test/silence button silences the alarm and allows you to test its functionality. The unit monitors and re alarms if carbon monoxide level persist sounding a loud 85 decibel horn. No installation is required and the attractive design allows the unit to be placed anywhere you need it. It includes an optional wall mount with no outlet required. An audible and visual battery signal alerts you to replace the battery. Pull down action chart has convenient guide on what to do if an alarm sounds. 5 year limited warranty. Ul listed.
Keep your family safe with this easy to use, battery operated carbon monoxide alarm; Battery powered alarms provide continuous monitoring of CO levels, even if there’s a power failure
Features an advanced electrochemical carbon monoxide sensor that accurately detects carbon monoxide levels, no matter where the detector is placed in the room.The alarm sequence should last 5-6 seconds. If it does not alarm, make sure fresh batteries are correctly installed, and test it again. If the unit still does not alarm, replace it immediately
A loud 85 decibel alarm sounds when CO levels reach dangerous , Battery Replaceable – Yes
To ensure complete protection make sure to place one on each level of your home and in each bedroom
5-year limited warranty; Equipped with end of life signal chirp, so you know when it’s time to replace the unit for safety
All first alert CO alarms are rigorously tested to meet UL standards
First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert Brand Trust Survey in February 2018)
13 reviews for First Alert CO400 Carbon Monoxide (CO) Detector, Battery Operated Alarm, 1-Pack
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$19.99
Steven –
Great Carbon Monoxide Detector – Easy to Install and Reliable!
I bought two of the First Alert Carbon Monoxide Detectors (model CO400), and I’m very happy with them. They were super easy to install — no outlet needed since they run on batteries. I just mounted them on the wall, and they were ready to go in minutes.I like that the battery operation means I can place them anywhere in my home without worrying about finding a plug. The alarm is loud enough to hear clearly, and the design is compact and simple.It gives me peace of mind knowing my family is protected. Overall, great value, easy setup, and reliable safety product. Highly recommend!
aj –
easy to install co detector
this is an easy to install battery operated co detector that functions as an alert system against the odorless and colorless co. this provides my family with peace of mind. the device is compact and easy to read if there is co detected. the batteries are easy to replace.
Ava Campbell –
Great value, easy installation, good quality
I was able to easily mount it to my wall. Seems reliable, glad it comes with batteries. Price is reasonable! Alarm sound is super loud and it’s easy to test. Overall I’m satisfied and I’m glad I made this purchase. I feel secure knowing this is in my house.
AdamPA –
Great, long lasting product
This CO detector worked as expected. I think I only changed the battery once or twice in ~6.5 years of operation. That 6.5 years is well past the 5 year warranty for the sensor.My only cons for this device are:1) The warranty for the plug in model, that looks identical and costs about the same, is 7 years. I don’t under why the battery powered model is expected to last two years less.2) I would like to see a ppm display or at least a larger colored light status indicator. When mine reached end of life, the indicator chirps were similar enough to the dead battery chirps that, after I replaced the battery and they continued, I was a bit paranoid about leaving for the weekend because I wasn’t sure if there was a CO problem or not. Fortunately I have the same model upstairs and moved that one downstairs without issue, but it would be nice to have a clearer indication of what’s going on.That said, I would, and will, buy these again.
Precise Disarray –
for home, for travel, for car (add to winter car bag in case stuck in blizzard). 9 volt included
I purchased two packs of the pack of 2. So far so good!? Tested fine. Hope it actually works, which is why I went with a name brand. This is not the place to skimp.The C0400 carbon monoxide detector comes with a 9 volt battery. I knew I needed to replace my existing detector (they dont last forever, and need to be replaced ever so often) and I did not want the plug in style. I wanted battery operated so I could place it wherever I wanted and not be limited to available outlets. I also bought a second pack as a gift. I prefer giving practical, functional gifts, especially stuff that people tend to not want to buy, such as smoke alarms, fire extinguishers, carbon monoxide detectors.If you travel, consider a battery operated detector such as this. Dont trust that a hotel room has you covered, or someone else’s house. It is small and light weight enough that it should be the thing to pack (take out battery, store separately until in room).I will likely buy an additional pack. Right now I have one on the first floor, and one outside my second floor bedroom door. I think having one in the basement and another in actual bedroom or elsewhere (spread out) would be better. Watch for sales, but if need be just buy them at any cost so you have them.I am even thinking about adding one to my winter car kit. If ever stuck in a blizzard and had to stay in my car for any length of time, having a detector will help as CO2 levels can quickly rise if running car (or if a few people are simply breathing without the window open a crack) to keep warm. Tail pipes can easily clog especially if windy. So yeh, simple thing to stay safe and alive
Bob –
Great choice for quality & price
works as advertised.
April D –
Works as described.
Works as described. I’m happy with this product.
Road Warrior Ray –
Install was Easy
Installed it easily where the smoke detector was. Hopefully, I w never need this..!
Amazon Customer –
I purchased this alarm to install in the upstairs hallway between bedrooms. It was very easy to install and works perfectly and provides the added security I required. I was surprised and happy at how quickly the parcel arrived!
Chuck –
Quickly mounted to the wall and put batteries in. Tested. Made beep noises that split eardrums. Due to the battery nature of it it can mount anywhere close to the ground to detect CO quickly.I wont truly know if it works, and I hope I never need to, but appears solid.
roger skinner –
This unit is very similar to the one we had for over 15 years. CO2 is a danger & we now feel safe again with the new alarm in place. The unit is just a simple plug in, but we did have to read up on where to put it. Placing it correctly is important so study up & get it right.
Holly M –
I bought two of these and say so far they have not worked…which is a good thing! Its nice just knowing we have piece of mind
Riza Gee Why –
Haven’t used it yet, but for the price it’s a no brainer. Carbon monoxide is a life threatening hazard and buying one or 2 of these carbon monoxide detectors is an essential for any household. I like that this is battery operated and can be placed anywhere.