5 out of 5
BRK First Alert 5268511 First Alert CO5120BN Hard-Wired Carbon Monoxide Alarm with Backup
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Product Description
The BRK First Alert CO5120BN is a hard-wired T4 carbon monoxide alarm with battery backup.
OVERVIEW
The BRK First Alert CO5120BN is a hard-wired carbon monoxide combo alarm with battery backup. It features a CO sensor, Intelligent Sensing Technology™ for fewer unwanted alarms, an 85dB horn, 9V battery backup, side-load battery drawer, two silence features and is interconnectable with up to 18 devices. Applications include residential and institutional applications including hospitals, hotels, motels, dormitories and other multi-family dwellings.
The Intelligent Sensing Technology" system is designed to reduce nuisance alarms. The "Latching Alarm Indication" remembers which unit initiated an alarm. When interconnected, the unit that triggered the alarm rapidly flashes its red LED indicator. After the alarm condition subsides, the initiating unit will store in memory or "latch" the information and begin to flash the red LED indicator once every 5 seconds.
The "Smart Interconnect" feature allows the unit to be interconnected to other BRK CO and smoke alarms. If there is a smoke event, the interconnected CO5120BN horn pattern will emit the T4 alarm sound, the same sound as a smoke alarm (4 beeps, pause, 4 beeps). If there is a CO event, the interconnected CO alarms will sound with their normal horn pattern. Battery installation and removal can occur while the unit is mounted via the side load battery compartment.
Additional Details
MANUAL
- Hard wired for installation by a licensed electrician.
- T4 alarm pattern with loud 85 decibel alarm.
- Reduced nuisance alarms with Intelligent Sensing Technology.
- Interconnectable with up to 18 BRK alarms.
- Battery backup for audible alarm.
OVERVIEW
The BRK First Alert CO5120BN is a hard-wired carbon monoxide combo alarm with battery backup. It features a CO sensor, Intelligent Sensing Technology™ for fewer unwanted alarms, an 85dB horn, 9V battery backup, side-load battery drawer, two silence features and is interconnectable with up to 18 devices. Applications include residential and institutional applications including hospitals, hotels, motels, dormitories and other multi-family dwellings.
The Intelligent Sensing Technology" system is designed to reduce nuisance alarms. The "Latching Alarm Indication" remembers which unit initiated an alarm. When interconnected, the unit that triggered the alarm rapidly flashes its red LED indicator. After the alarm condition subsides, the initiating unit will store in memory or "latch" the information and begin to flash the red LED indicator once every 5 seconds.
The "Smart Interconnect" feature allows the unit to be interconnected to other BRK CO and smoke alarms. If there is a smoke event, the interconnected CO5120BN horn pattern will emit the T4 alarm sound, the same sound as a smoke alarm (4 beeps, pause, 4 beeps). If there is a CO event, the interconnected CO alarms will sound with their normal horn pattern. Battery installation and removal can occur while the unit is mounted via the side load battery compartment.
Features:
- Latching alarm indicator remembers which unit initiated an alarm
- Intelligent Sensing Technology reduces nuisance alarms
- 85dB horn
- T4 sound pattern
- Smart Interconnect is interconnectable to both BRK smoke and CO alarms
- Two silence features can silence the low battery chirp up to 8 hours or temporarily silence and unwanted alarm
- Quick, easy installation
Additional Details
| Feature | Details | |
|---|---|---|
| Brand | First Alert | |
| Mfg part # | 5268511 | |
| UPC | 029054856173 | |
| Warranty | Seven year limited warranty | |
| Weight (lbs) | 0.57 | |
| Battery operated? | Yes (batteries optional) | |
| Batteries included? | Yes | |
| Battery details | (1) 9V Alkaline | |
| Country of Manufacture | Mexico | |
| System | (no system / stand-alone) | |
| Alert Type(s) Vibration Flashing Light Loud Audible Low Vision / Deaf-Blind | No No Yes No | |
| Transmitter / Receiver | Transmitter | |
| Alert Trigger(s) Baby Cry Carbon Monoxide Mobile / Smartphone Doorbell / door knock Motion Pager / SOS Phone / VP Smoke / Fire Sound Severe Weather | No Yes No No No No No No No No | |
| Expandable | Yes | |
| Portable | No | |
| Battery backup | Yes | |
| USB charger | No |
MANUAL
- User Manual - Download
Attention CA Residents: Prop 65 Warning
WARNING:
This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.
Product Warranty
This item has seven years limited warranty.
Return Policy
Return is subject to a restocking fee of $8 per item. Return could only be applied within 30 days after delivery.
Need more information?
Our staff are available to answer any questions you may have about this item
Our staff are available to answer any questions you may have about this item
Customer Reviews
By L. Huey
Date: June 23, 2025
The product showed up ready to install with batteries already in the detector with an easily removed piece of tape on the contacts. Very easy to deal with.
Rating: 
[5 of 5 Stars!]
[5 of 5 Stars!]
By NJ
Date: June 21, 2025
Thenbsp;FIRST ALERT BRK SC7010B-3 Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup units were easy to install.nbsp; I have ordered additional units to replace all of my hardwired smoke detectors so that they will also detect Carbon Monoxide,
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Mary Parsons
Date: June 20, 2025
Use these in our home they last about 10 years before they bonkers. nbsp;We really like the brand they are reliable.
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Lynn C. Blaylock
Date: June 03, 2025
The items arrived very promptly - within two days. They are exactly what I ordered.
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By poxbox
Date: June 03, 2025
Easy install. Nice to have batteries you can replace in there easily (Not a 9v). I've had these units for 3 years now and one of them had a false alarm. So It's a good detector.... not a great one. Not sure if any of them don't false alarm.
Rating: 
[3 of 5 Stars!]
[3 of 5 Stars!]
By A
Date: May 18, 2025
Easy install
Rating: 
[4 of 5 Stars!]
[4 of 5 Stars!]