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First Alert CO400

First Alert CO400
alaScore 87

13 reviews

May, 2025

  • Negative

alaTest has collected and analyzed 13 reviews of First Alert CO400. The average rating for this product is 4.6/5, compared to an average rating of 4.6/5 for other products in the same category for all reviews. Reviewers really like the usability.

usability

We analyzed user and expert ratings, product age and more factors. Compared to other products in the same category the First Alert CO400 is awarded an overall alaScore™ of 87/100 = Very good quality.

Review analysis

(Based on 13 reviews)

User Reviews  

Showing 13 review(s)

Expert Reviews User Reviews

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Showing 1 - 10 of 13 Show Reviews: in English

Consumer review (homedepot.com)

Great product.

 

This detector was easy to install and was a replacement for an older model.

Sep, 2013

Consumer review (homedepot.com)

Performs as expected

 

Easy to install. I assume (hope) the CO detector is working as expected since I have heard no alarm and presume there has been no CO to detect.

Jul, 2013

Consumer review (homedepot.com)

This product has a low profile and installs easily into any environment.

 

This carbon monoxide detector has a mute button and is easy-to-install, not to mention it was priced right.

Apr, 2013

Consumer review (homedepot.com)

Works great

 

Works as designed, easy to install, satisfies CA law to have carbon monoxide detectors on each level of residence. Looks fine.

Apr, 2013

Consumer review (homedepot.com)

Wonderful experience ordering from HD online.

 

Product was just as described. The arrival took a little longer than expected. i would definitely do business with HD online again. Thank you!

Apr, 2013

Consumer review (homedepot.com)

I recommend this product.

 

This is a great product to have in every home. It is loud and small that it hides on your wall.

Feb, 2013

Consumer review (homedepot.com)

Works Great!!

 

Just installed a new gas line for a new gas dryer I bought at Home Depot and the product works great. Tested multiple joints and it worked flawlessly. Would recommend to a friend.

Feb, 2013

Consumer review (homedepot.com)

For the price alone... it's a no-brainer!

 

We already installed a CO alarm in the hallway just outside the bedrooms. But considering the reality that we often have guests sleep over on the couch, this could also be considered a sleeping area. Hence, the addition of this 2nd CO alarm in the...

Dec, 2012

Consumer review (homedepot.com)

NEEDS IMPROVING THIS PRODUCT DOOR

 

THE CLIP ON THE BATTERY DOOR BROKE BEFORE I INSTALLED THE BATTERIES,AND IT WAS TO HAVE A SMALL SHEET OF PAPER THE TO SHOW YOU WHERE THE MOUNTING SCREW HOLES WERE TO GO,AND IT DIDN'T .I USED SOME DOUBLE SIDED TAPE TO MOUNT IT ON THE WALL,SO IT UP ON THE...

Oct, 2012

Consumer review (homedepot.com)

Good product

 

Was all I expected it to be. Have these items in my home already, just adding more. Am very pleased.

May, 2012
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