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»»»»First Alert CO400 Battery Powered Carbon Monoxide Alarm
Review of First Alert CO400 Battery Powered Carbon Monoxide Alarm$14

Review of First Alert CO400 Battery Powered Carbon Monoxide Alarm

Very Good
4.20 stars
Price Range
Reviewed on: July 11, 2013
Author: BoolPool.com

Pros & Cons

  • Easy to install, battery powered
  • Free standing design or easily mounts on walls
  • Single test and silence button operation
  • Low battery or end of life warning indicator
  • Convenient front battery access for easy replacement
  • Compact and includes 2 AA batteries
  • Reasonable price with shelf life of 5 years
  • Flimsy battery latch
  • Battery door does not close securely

Review Summary

This is the summary of consumer reviews for First Alert CO400 Battery Powered Carbon Monoxide Alarm. The BoolPool rating for this product is Very Good, with 4.20 stars, and the price range is $14.00-$19.99.

The First Alert Battery-Powered Carbon Monoxide Alarm is an easy to use CO detector that uses an electro-chemical carbon monoxide sensor, which is the most accurate technology available. It can detect the CO you can't see, smell or taste in the air. A single button tests alarm functions and mutes nuisance or non-emergency alarms. With battery backup, you will have peace of mind that the alarm will continue to work even during power outages. An audible and visual low battery signal alerts you to replace the battery. Its attractive, compact and pleasing design is ideal for placing in all visible location with no installation required. The easy loading front access battery door allows you to quickly and easily change 2 AA batteries. It’s backed with a 5-year limited warranty and meets UL standards and is code compliant.

However, the major concern faced with this unit is the battery door mechanism. The flimsy battery door is made of cheap plastic material. The plastic latch breaks off easily if closed without installing the batteries (No such warning is mentioned with the device) or sometimes the door did not close securely thus leading to malfunction of the device.

Overall, The First Alert CO400 battery powered carbon monoxide detector is a recommended, easy-to-install, user friendly device that combines advanced technology at reasonable price for maximum protection.


  • Product Dimensions: 6.38 x 8.56 x 2.29 inches
  • Product Weight: 0.81 pounds

User Voice

Cluster Help
Review Group #: 1
(3.50 stars)
7 Reviews
Simple installation Thin plastic latching mechanism Plastic latch breaks if closed without installing the batteries Battery door does not close securely
Review Group #: 2
(4.50 stars)
9 Reviews
Easy and simple to test the operation Compact device Loud beep sound Low battery warning feature Easy to operate and install
Review Group #: 3
(4.00 stars)
12 Reviews
Small and compact design Loud indicator Multiple mounting options Easy to mount on wall or place it anywhere Includes 2 AA batteries
Review Group #: 4
(4.50 stars)
17 Reviews
CA law requires one detector on each level Requires 2 AA batteries Safe and nice CO detector Installs anywhere in the house
Review Group #: 5
(4.50 stars)
33 Reviews
Right price Tested and works fine Great CO detectors
Review Group #: 6
(4.50 stars)
45 Reviews
Easy to install, use and test Easy to maintain Economical and efficient device

Where to Buy

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Review Sources

Amazon.com  ‎ Rating: 4.00 stars from 423 reviews‎‎, Price: $16.79 ‎
Amazon.com  ‎ Rating: 4.40 stars from 33 reviews‎‎, Price: $36.70 ‎
Walmart.com  ‎ Rating: 4.30 stars from 63 reviews‎‎, Price: $14.27 ‎
HomeDepot.com  ‎ Rating: 3.80 stars from 19 reviews‎‎, Price: $19.97 ‎

Product Research

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Ratings Badge

★★★★★ (4.20 stars)
Rating: Very Good
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