First Alert Hard-Wired with Battery Back-up Electrochemical Carbon Monoxide Alarm(CO5120BN)

Item no: 5268511 | 029054856173
370  Estimated 

FREE Pickup at your local Ace! Find my Ace. (details)
to-done LIST

at Your Local Ace

Ship to home is available. Leaves warehouse in 1 to 2 bus. days. (details)
STORE AVAILABILITY: Your neighborhood Ace stocks thousands of products in the quantities you need. Check with your local Ace for availability. (find your local Ace)
  • Power Type: Hard-Wired with Battery Back-up
  • Sensor Type: Electrochemical
  • Product Type: Carbon Monoxide Alarm
  • ETL Listed: Yes
  • Detects Smoke: No
  • Indoor and Outdoor: Indoor
  • CSA Listed: No
  • UL Listed: Yes
  • Detects Carbon Monoxide: Yes
  • Color Family: White
  • Test and or Reset Button: Yes
  • Number in Package: 1 pk
  • Volts: 120 volts
  • Intelligent sensing technology.
  • Side load battery drawer.
  • Latching alarm indicator - remembers which unit initiated alarm.

This item can be shipped to your home. Or pickup this item at your local Ace Store for FREE*.

*Items shipped from our warehouse to stores in Alaska and Hawaii will receive a 70% shipping discount.

30-Day Return Guarantee

We want you to be fully satisfied with every item that you purchase from If you are not satisfied with an item that you have purchased (subject to the return exceptions below), you may return the item up to thirty days after the original purchase date to receive a refund (less shipping, handling and other charges). We recommend that you make returns of online purchases to an Ace retail store near you which will issue you a refund. If you do not have an Ace retail store near you, please contact a Customer Service Specialist by calling 1-866-290-5334 for complete return instructions. Please refer to our Return Instructions for more information about returning a purchase.

The item must be returned in good condition, in original packaging (whenever possible), with all paperwork (including product instructions or information and your packing slip), and parts and accessories to ensure full credit for purchase price (not including shipping and handling, gift-wrap, or additional charges). After 30 days from the original purchase date, please contact the manufacturer directly.

Return Exceptions:

30 Day Return Policy does not include Gift Cards, Magnolia Home Paint or gas-powered outdoor equipment.

  • Gift Cards cannot be returned for any reason.

  • Because each Magnolia Home Paint product is made to order, undamaged paint products are non-refundable. Magnolia Home Paint products purchased on cannot be returned for any reason. If your Magnolia Home Paint product arrives incorrect or damaged, please contact a Customer Service Specialist by calling 1-866-290-5334.

  • Gas-Powered Outdoor Equipment (such as tillers, edgers, mowers, string trimmers, blowers, tractors, generators, chainsaws, snow blowers, as well as all other gas powered chore equipment) may be returned within 30 days of the date of purchase, with original receipt, provided that it is in like-new condition. Gas-Powered Outdoor Equipment cannot be returned once gas or oil has been put in it, even if the equipment has been drained of these materials.

Please note that if your Gas-Powered Outdoor Equipment is defective or is not functioning properly, its service and warranty issues will be handled through the authorized service center. See Return Instructions for more information.

What people are saying

sort by:


by PowerReviews
FIRST ALERTBRK Electronics Carbon Monoxide Detector

(based on 2 reviews)

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars



Reviewed by 2 customers

Displaying reviews 1-2

Back to top


Perfect replacement

By Sara

from Florida

About Me Casual Do-It-Yourselfer

Verified Buyer


  • Early Warning
  • Reliable
  • Sensitive


  • None

Best Uses

  • Bedrooms

Comments about FIRST ALERT BRK Electronics Carbon Monoxide Detector:

We built our home in 2001. Our smoke detectors are integrated and hardwired. Similarly our carbon monoxide detectors are integrated and hardwired, separately from the smoke detectors. When one of our carbon monoxide detectors stopped working, we searched for a replacement and found this combo smoke/carbon monoxide detector (note that the website was unclear that it was a combo unit). We were concerned that by having the additional smoke detection function, it wouldn't integrate with the remaining carbon monoxide detectors. But, there was no problem. It integrated in perfectly and saved us a lot of cost/time that we would have had to spend if we had needed to replace all the other ones to ensure system integration.

(1 of 1 customers found this review helpful)


Does what it was desinged to do

By Shep

from Stow, MA

About Me Casual Do-It-Yourselfer

Verified Buyer


  • Sensitive


  • Replaced after four years

Best Uses

  • Bedrooms
  • Garage
  • Living Room

Comments about FIRST ALERT BRK Electronics Carbon Monoxide Detector:

Only issue with this product is that I had to replace after four years. Manual recomends replacing every seven years.

Displaying reviews 1-2

Back to top

© 2018 Ace Hardware Corporation. Ace Hardware and the Ace Hardware logo are registered trademarks of Ace Hardware Corporation. For U.S. Residents Only.
HACKER SAFE certified sites prevent over 99% of hacker crime.

Add Item to To-Done List

To use this feature you must be signed-in to your account, please sign in now. If you do not have an account, please create an account to participate.

Ace Rewards

Ace Rewards is a free and rewarding membership program that lets you earn rewards with every purchase you make! Join now.