First Alert CO400 Battery-Powered Carbon Monoxide Detector

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The noise is loud enough for everyone in the house to hear and receive sufficient time to get out of the house. The First Alert CO400 Battery-Powered Carbon Monoxide Detector also offers stability against changing temperatures and humidity to avoid false alarms or the failure of internal circuitry.
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About this item

Important Made in USA Origin Disclaimer: For certain items sold by Walmart on Walmart.com, the displayed country of origin information may not be accurate or consistent with manufacturer information. For updated, accurate country of origin data, it is recommended that you rely on product packaging or manufacturer information.
The First Alert CO400 Battery-Powered Carbon Monoxide Detector is an easy-to-use product that comes with one carbon monoxide alarm, a user's manual and two AA batteries. It features a test/silence button that silences the alarm and allows you to test its functionality. This detector also monitors and re-alarms if carbon monoxide levels persist, sounding a loud 85-decibel horn. No installation is required for this carbon monoxide detector alarm, and the attractive design allows the unit to be placed anywhere you need it. The alarm includes an optional wall mount with no outlet required, and is powered by two AA replaceable alkaline batteries, giving you peace of mind even during power outages. One of the main benefits of having this First Alert carbon monoxide detector is that it serves as an early warning if any carbon monoxide is leaking into your home.

About this item

Important Made in USA Origin Disclaimer: For certain items sold by Walmart on Walmart.com, the displayed country of origin information may not be accurate or consistent with manufacturer information. For updated, accurate country of origin data, it is recommended that you rely on product packaging or manufacturer information.

The First Alert CO400 Battery-Powered Carbon Monoxide Detector is an easy-to-use product that comes with one carbon monoxide alarm, a user's manual and two AA batteries. It features a test/silence button that silences the alarm and allows you to test its functionality. This detector also monitors and re-alarms if carbon monoxide levels persist, sounding a loud 85-decibel horn. No installation is required for this carbon monoxide detector alarm, and the attractive design allows the unit to be placed anywhere you need it. The alarm includes an optional wall mount with no outlet required, and is powered by two AA replaceable alkaline batteries, giving you peace of mind even during power outages. One of the main benefits of having this First Alert carbon monoxide detector is that it serves as an early warning if any carbon monoxide is leaking into your home.

The noise is loud enough for everyone in the house to hear and receive sufficient time to get out of the house. The First Alert CO400 Battery-Powered Carbon Monoxide Detector also offers stability against changing temperatures and humidity to avoid false alarms or the failure of internal circuitry. This stability also helps them accurately respond to carbon monoxide and not other common household gases or chemicals such as ammonia.
First Alert CO400 Battery-Powered Carbon Monoxide Detector:

  • Carbon monoxide detector alarm uses electrochemical sensor for increased security
  • First Alert alarm mute feature silences detector when nuisance alarm sounds
  • Single button tests alarm functions
  • Easy front access to the battery
  • Meets UL standards
  • Battery operated, 2 AA batteries included
  • End-of-life timer, alarm chirps when it is time to replace it
  • Loud 85db alarm
  • First Alert carbon monoxide detector includes manufacturer's 5-year limited warranty

Explore this item

Specifications

Battery Type: Alkaline
Multi Pack Indicator: No
Model No.: CO400
Shipping Weight (in pounds): 3.779
Walmart No.: 1110013
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Comparison Table

Brand Image
Alarm Type
Alarm Type
Power Type
Power Type
Digital Display
Digital Display
Test/Silence Button
Test/Silence Button
Remote Control Silence
Remote Control Silence
Multi-Pack Available
Multi-Pack Available
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Manuals & Guides

Customer Reviews

Customer Reviews | 80 reviews | 4.3 out of 5

4.5 stars

80 reviews | 4.3 out of 5

4.5 stars

80 reviews | 4.3 out of 5

89%
Would recommend to a friend
5 stars
51
4 stars
16
3 stars
4
2 stars
4
1 stars
5
1-5 of 67 total reviews
89%
Would recommend to a friend

Age

Gender

Monoxide Detector
2/6/2016

Customer review by Bigkid64801

5.0 stars 2/6/2016 by Bigkid64801
by Bigkid64801

Purchased this for the garage. Using a propane heater to heat with while I'm working out there.

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Bigkid64801
Would recommend to a friend? Yes
Just what I needed
11/17/2009

Customer review by Troys98

5.0 stars 11/17/2009 by Troys98
by Troys98

This product is great for placement exactly where you need it. We had a new gas waterheater installed to replace an existing electric. Being that it is gas I felt the need to have this item installed so that if there ever were a problem with the waterheater we would know. I was able to install it in the room right where I wanted it without having to worry about cord placement, etc. Highly recommend.

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Troys98
Salisbury, MD
Would recommend to a friend? Yes
Age:35 - 44
Ownership:2 - 7 weeks
Gender:Male
Usage:Every day
Battery door shown wrong.
1/30/2016

Customer review by dootpost

5.0 stars 1/30/2016 by dootpost
by dootpost

Shows battery door on front (easy battery replacement) but door is on back (not so easy}.

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dootpost
Would recommend to a friend? Yes
a very necessary product
3/25/2010

Customer review by theexmichigander

5.0 stars 3/25/2010 by theexmichigander
by theexmichigander

it is now a law that you must have a carbon monoxide detector, and if it wasn't you would be very foolish not to have them in your home. it was very easy to install, and it was very helpful that the detector came with the batteries including. it was very easy to shop Walmart Online and will be doing it again

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theexmichigander
Elmira,NY
Would recommend to a friend? Yes
Age:65 or older
Ownership:2 - 7 weeks
Gender:Male
Usage:Every day
Works Great in My Antique Car!
6/22/2009

Customer review by KellydaBelly

5.0 stars 6/22/2009 by KellydaBelly
by KellydaBelly

I bought this detector for my antique car which I suspected was getting some exhaust in the cabin. The possibility of carbon monoxide inside the car worried me. Sure enough when we got the car out on the open road the alarm went off! So now we are having a mechanic look into the possibility an an exhaust leak. So this device works and it is a good value.

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KellydaBelly
Florida
Would recommend to a friend? Yes
Age:45 - 54
Ownership:2 - 7 weeks
Gender:Female
Usage:Every day
1-5 of 67 total reviews See all
1-5 of 67 reviews

Customer Reviews | 80 reviews | 4.3 out of 5

Customer Reviews

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Customer Q&A

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Questions & Answers 14 questions
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by an anonymous customer 5/3/2011
8 answers
  • A. NO. You can have enough CO in the air to kill you without noticeable smoke so this serves a different alarm purpose. Other combo models do both jobs but his one is just CO.
    by OzzieSr10/17/2015
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  • A. NO. It has no means to detect smoke.
    by SylviaII10/17/2015
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  • A. No, this is separate. However, they do sell ones that are smoke detectors AND carbon monoxide detectors, Walmart has them too.
    by LoveBling10/17/2015
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  • A. A CO alarm does not replace a smoke alarm. Each alarm warns ONLY about the danger for which it was designed.
    by donever10/17/2015
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  • A. no
    by p6243w7/23/2011
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  • A. NO. While there are more expensive models on the market that provide both CO detection/alarm and smoke detection/alarm, this inexpensive unit monitors/alarms ONLY for CO.
    by LivingstonRandy7/22/2011
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  • A. Absolutely not!! You need both. Your smoke detector will not in most cases detect carbon monoxide and vice versa.
    by Revel2226/15/2011
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  • A. Yes. It replaces a wired unit.
    by Tridd3/12/2015
    Was this answer helpful? (1) (6)
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Product warranty:  5 Years See details

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