Customer Reviews For The First Alert Basic Battery Operated Carbon Monoxide Alarm - CO400

172 Reviews

4.9 Overall rating

Rick F
November 7, 2022
Verified Purchase

Order process was simple and product arrived as scheduled. Installed the included battery, tested then mounted on wall where the old one was. Now I can only hope it works when necessary....fingers crossed that time never comes!! The previous one was replaced as a result of the end-of-life alarm feature. It was already in use when I moved into the house Nov 2016. I would reccommend.

Betty H
October 10, 2022
Verified Purchase
Carbon Monoxide Alarm purchase

Our carbon monoxide alerted us that it was at end of life. We quickly replaced it thru First Alert. We have been fortunate to never need the alarm but we know of friends who are still alive because their First Alert woke them up. The order process was so easy and efficient.

Manuel C
September 8, 2022
Verified Purchase
easy install

Ordered exact same model to replace. Easy to install with existing mounting screws.

William A
September 5, 2022
Verified Purchase
Thanks First Alert

Ordered product to replace expiring unit. Came very quickly, with an included battery and placed in previous position to protect the home. Great service.

Darlene S
November 8, 2021
Verified Purchase
First Alert Alarm

Replaced the original with the same type. Fast shipping and easy set up. Will replace with same when needed. Love it!

September 29, 2021
Verified Purchase

As promised, order arrived quickly, in mint condition. and with clear instructions as to how to set up and use it. The alarm worked perfectly the first time, and I have no doubt it will last as long as the one it replaced.

George N
May 17, 2021
Verified Purchase
Couldn't Have Been Easier

I recently had to replace my First Alert CO detector. I decided to buy the same Model#. When did a Google search for that item, I was pleasantly surprised to find that the First Alert direct price was the lowest, and shipping was free. The whole ordering process was very easy, and I received the item quickly.

Tom Rubenstein
March 2, 2021
Verified Purchase
Basic Battery Operated Co2 Alarm-CO400

Ordered product directly for First Alert website...easy to navigate and simple order process. Received product within 3 days. Directions for install were thorough and straightforward.

James D Stewart
January 25, 2021
Verified Purchase
Fast and easy

I have ordered from this site before. It is easy to order and delivery is fast. Product arrived and is as described on the web site. Good product.

Lisa Andrade
December 17, 2020
Verified Purchase
Fast Service!

Very easy to order and fast service!

Karen Eskew
December 1, 2020
Verified Purchase

Always use first alert products. Very trustworthy and safe.

Steve K
November 30, 2020
Verified Purchase

Works fine and easy to install

Philip Davis
October 10, 2020
Verified Purchase
Three pack

Fast delivery, packaged well, exactly as expected.

Bernard Dube
August 4, 2020
Verified Purchase

My order came in and seems to be operating well. Thank you

Allan Griff
July 20, 2020
Verified Purchase

Nothing wrong with device, but was disappointed to find bolt holes not same distance be so I had to put in a new wallbolt. B

Elisa Goodwin
July 6, 2020
Verified Purchase
Works as expected!

Received the item on time and it works as expected. Happy with my purchase thus far. One item to note: the placement of the screw holes in this model has changed in recent years, so while I was trying to avoid having to drill new holes by purchasing the same model as I was replacing, I did have to accommodate the change in design.

Melvin Matter
June 1, 2020
Verified Purchase
New CO400 to replace old CO400

Very good unit to purchase. One thing to note. The model number was the same as old CO detector we had, however new one would not mount on old mounting brackets. The screws were at different lengths so had to drill more holes in the wall. Would be nice if the model number had consistancy.

Robert Nicosia
June 1, 2020
Verified Purchase
First Alert CO-400 Carbon Monoxide Alarm

This new CO detector is excellent. It replaces my previous CO-400 which needed to be retired after 8 years of reliable service. It makes sense to stay with a winner. The First Alert Store was a pleasure to deal with and they had my new detector in my hands within a week.

Michael Arden
May 20, 2020
Verified Purchase
So far so good

Seems to be working OK after a month

joseph dillon
May 10, 2020
Verified Purchase
The very BEST

Years of use...

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