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First Alert CO400B Battery-Operated (2 AA) Carbon Monoxide Alarm

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Manufacturer:BRK Electronics

Manufacturer Part#:BR-CO400B

Our Part#:BR-CO400B

Stock Status: In Stock

Retail Price:$27.13

Your Savings:$1.81(7%)

Your Price:$25.32

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Feature:

BRK Electronics

Feature:

BR-CO400B

Feature:

Yes

Feature:

029054000743

Feature 5

Yes

The CO400B is branded by BRK Electronics as First Alert®

The CO400B is a direct replacement for the BRK/First Alert BCD3BN

The CO400B is a battery operated carbon monoxide alarm designed for portability. No installation is required and can be mounted or placed almost anywhere.

Uses 2 AA batteries (not included)
Table top use or wall mount
Permanent sensor
Samples air once every second
Calibrated at four levels for accuracy
Test/silencer button realarms if levels persist
Unique self testing system alerts if malfunctions
3 indicator lights green power status, yellow service, red warning
5 year limited warranty
Meets New York, Massachusetts, & Oregon Carbon Monoxide Regulations.

View all Q&A

Q: My First Alert Carbon Monoxide Alarm is chirping every few seconds; Does that mean it it needs new batteries? Thank you!

Asked by: Susan - 7/4/2016

A: Possibly, or it could have reached the end of its life. Put new batteries in and if it continues to beep then replace it.

Was this answer helpful? 1 of 1 Customer(s) found this Answer helpful.

Answer provided by: Dave Petersen (11/10/2017)

Q: I've had my detector for 21 years. It's now starting to beep all the time. What is the usual lifetime for this item? Do I need to get a new one? Thanks.

Asked by: Dee - 6/26/2016

A: You have been extremely lucky if you had a CO detector for 21 years and it is only now beeping... They generally only last 5 - 7 years... I would suggest replacing it immediately, chances are it hasn't worked in years.

Was this answer helpful? 0 of 0 Customer(s) found this Answer helpful.

Answer provided by: Dave Petersen (11/10/2017)

Q: I have battery operated carbon monoxide detector with First Alert logo. I cannot figure out how you open it and check battery, Does it slide apart? have a release point?? pop off?

Asked by: Dennis Lewis - 6/20/2016

A: without a part number to go by, I would only be guessing. Find out the part number and search for it on our site, if you find it go to the Blue Documents Tab for the Data Sheet and look at Page 2, the Battery info is usually there.

Was this answer helpful? 0 of 0 Customer(s) found this Answer helpful.

Answer provided by: Dave Petersen (11/10/2017)

Q: put in new aa batteries three times yet after two weeks or less the 5 beeps go off. what are we doing wrong? why doesn't first alert alarm work for longer than two weeks?

Asked by: bill - 2/21/2016

A: How old are these units? These are Carbon Monoxide Detectors with a lifespan of 4 - 6 years, could be that they have reached the end of their life and they are telling you it is time to replace them.

Was this answer helpful? 0 of 0 Customer(s) found this Answer helpful.

Answer provided by: Dave Petersen (2/22/2016)

Q: My alarm went off (3 chirps), then stopped. I changed the batteries and it is now flashing intermittently but no sound. I put my other detector on the second floor (also a First Alert detector), and it is fine. Does this chirp when it is time to change batteries?

Asked by: David - 2/10/2016

A: The chirp can mean it has a low battery or that the detector is coming to the end of its life. CO Detectors have a 4 - 7 year life span and when the sensor gets too old the detector will chirp.

Was this answer helpful? 18 of 18 Customer(s) found this Answer helpful.

Answer provided by: Yvette Holladay (2/10/2016)

Q: What is the life expectancy of this alarm?

Asked by: A W Pierce Jr - 2/3/2016

A: 5 - 7 Years

Was this answer helpful? 0 of 0 Customer(s) found this Answer helpful.

Answer provided by: Dave Petersen (11/10/2017)

Q: What does it mean when the red light flashes?

Asked by: Therese - 2/3/2016

A: The red light flashes every minute, indicating the alarm is receiving battery power (horn is silent)

Was this answer helpful? 7 of 7 Customer(s) found this Answer helpful.

Answer provided by: Yvette Holladay (2/10/2016)

Q: I have this carbon monoxide detector. I have 2 new AA batteries in it. I plugged it in the wall also. It started chirping every few seconds. I unplugged it and took the batteries out. It had stopped chirping. I plugged it in the wall without the batteries and now it is chirping again. What is your suggestion?

Asked by: JoanT - 11/18/2015

A: How old is the detector, these units have around a 4 year life and then they chirp to let you know it is time to replace it. It sounds just like a low battery chirp. If it is around 4 years old and still chirps after new batteries are installed, I would say that it is time to swap it out.

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Answer provided by: Yvette Holladay (11/18/2015)

Q: I cannot figure out how to get to the battery in this unit so I an change it?? Could you please give me instructions on how to get to the battery compartment? Thank you so much!!!

Asked by: kristel anderson - 11/10/2015

A: Click on documents tab just below the picture on the website, and download the data sheet. Page 2 has the instructions for battery changing.

Was this answer helpful? 0 of 1 Customer(s) found this Answer helpful.

Answer provided by: Yvette Holladay (11/10/2015)

Q: does this detector respond to 75 parts per million? ...and...does the "B" at the end of serial # mean "battery"?

Asked by: bob hofmann - 10/28/2015

A: Click on documents tab just below the picture on the website, and download the data sheet. The data sheet has all the information you require.

Was this answer helpful? 0 of 0 Customer(s) found this Answer helpful.

Answer provided by: Yvette Holladay (10/29/2015)