As an Amazon Associate I earn from qualifying purchases.
Indicator lights on the face of the unit display the presence of smoke or carbon monoxide, while an 85-decibel siren provides a clear, loud warning upon detection. Keep your family safe with this 6-pack of hardwired smoke and carbon monoxide alarms; The battery backup means constant monitoring, even if there's a power failure.
Simple to use, with a single test/silence button, and side-load battery compartment; tamper-resistant locking brackets and universal mounting brackets make installation easy. Can connect to other compatible BRK or First Alert detectors, to ensure all alarms will sound when threat is detected.

Features an electrochemical carbon monoxide sensing technology as well as intelligent smoke sensing technology to reduce nuisance alarms.


Keep your family safe with this hardwired smoke alarm the battery backup means constant monitoring, even if there's a power failure. Simple to use, with a single test/silence button, and side load battery compartment tamper resistant locking brackets and universal mounting brackets make installation easy.
First alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 Based on a First Alert Brand Trust Survey in February 2018. Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety. Equipped with an ionization sensor, this smoke alarm reliably detects smoke from fast flaming fires and alerts you with an 85 decibel alarm.

The spread spectrum horn is a lower frequency horn that makes it easier for the elderly with normal Aged Related hearing loss to hear the horn.

10-year limited warranty; equipped with end-of-life signal chirp, so you know when it’s time to replace the unit for safety. Features an electrochemical carbon monoxide sensing technology as well as intelligent smoke sensing technology to reduce nuisance alarms; Keyhole slots in the mounting bracket eliminate the need to remove the electrical box screws for installation.
Keep your family safer with this hardwired smoke and carbon monoxide alarm; The 10 year battery backup means constant monitoring for the life of the alarm even if there's a power failure, Single button test/silence. Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety.


End of life signal provides Audible Notice When Alarm Needs to be Replaced. Latching alarm indicator Remembers Which Unit Initiated an Alarm. Electrochemical co sensor is the most accurate technology available. Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety.

Rigorously tested to meet UL standards. Keep your family safe with this hardwired first Alert smoke and carbon monoxide alarm with a 10-year battery backup, which means constant monitoring for the life of the alarm, even if there's a power failure.
Convenient adapter plugs makes it easy to replace existing hardwired alarms without needing to rewire. To ensure complete protection make sure to place one carbon monoxide detector on each level of your home and in each bedroom. Simple to use, with a single test/silence button; includes 10-year lithium battery with a locked drawer to prevent tampering.
1. FIRST ALERT
#ad
First Alert BRK SC9120B-6 Hardwired Smoke and Carbon Monoxide Detector CO with Battery Backup. 6-Pack , White
#adFIRST ALERT #ad - Features an electrochemical Carbon Monoxide sensing technology as well as an ionization sensor that detects the fine particles of a fast-burning fire. Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety.Indicator lights on the face of the unit display the presence of smoke or carbon monoxide, while an 85-decibel siren provides a clear, loud warning upon detection. Keep your family safe with this 6-pack of hardwired smoke and carbon monoxide alarms; The battery backup means constant monitoring, even if there's a power failure.
More information #ad
First alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 Based on a First Alert Brand Trust Survey in February 2018. Simple to use, with a single test/silence button, and side-load battery compartment; tamper-resistant locking brackets and universal mounting brackets make installation easy. Can connect to other compatible BRK or First Alert detectors, to ensure all alarms will sound when threat is detected.
Brand | FIRST ALERT #ad |
Manufacturer | First Alert #ad |
Height | 2.2 Inches |
Length | 5.6 Inches |
Weight | 0.7 Pounds |
Width | 5.6 Inches |
Part Number | SC9120BFF-6 |
Model | BRK SC9120B-6 |
More information #ad
2. FIRST ALERT
#ad
FIRST ALERT BRK SC9120B Hardwired Smoke and Carbon Monoxide Detector with Battery Backup and FIRST ALERT BRK9120b6CP Smoke Detector Alarm | Hardwired with Backup Battery
#adFIRST ALERT #ad - Equipped with an ionization sensor, this smoke alarm reliably detects smoke from fast-flaming fires and alerts you with an 85-decibel alarm. Keep your family safe with this hardwired smoke alarm; the 10-year battery backup means constant monitoring for the life of the alarm, even if there's a power failure.Features an electrochemical carbon monoxide sensing technology as well as intelligent smoke sensing technology to reduce nuisance alarms.
More information #ad
Keep your family safer with this hardwired smoke and carbon monoxide alarm; the 10-year battery backup means constant monitoring for the life of the alarm even if there's a power failure. Keyhole slots in the mounting bracket eliminate the need to remove the electrical box screws for installation.Brand | FIRST ALERT #ad |
Manufacturer | First Alert #ad |
Model | SC9120B |
More information #ad
3. FIRST ALERT
#ad
First Alert BRK SC-9120B Hardwired Smoke and Carbon Monoxide CO Detector with Battery Backup
#adFIRST ALERT #ad - Easy to install universal mount bracket. Simple to use silence/test button; separate smoke and CO latching alarm indicators. Superior carbon monoxide sensor and dual ionization smoke alarm.More information #ad
9-volt battery included; 10-year limited warranty. Inter-connectable with BRK and First Alert hardwired smoke and carbon monoxide alarms. Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety.Brand | FIRST ALERT #ad |
Manufacturer | BRK Brands #ad |
Height | 5.69 Inches |
Length | 5.59 Inches |
Weight | 0.65 Pounds |
Width | 2.25 Inches |
Part Number | SC9120B |
Model | SC9120B |
More information #ad
4. FIRST ALERT
#ad
First Alert 9120B Smoke Detector, 1-Pack, Hardwired Alarm with Battery Backup
#adFIRST ALERT #ad - Can connect to other compatible BRK or first alert smoke detectors, to ensure all alarms will sound when smoke is detected. Rigorously tested to meet ul standards120 volt AC power with 9V battery backup to keep alarm functioning during power outage.Keep your family safe with this hardwired smoke alarm the battery backup means constant monitoring, even if there's a power failure. Simple to use, with a single test/silence button, and side load battery compartment tamper resistant locking brackets and universal mounting brackets make installation easy.
More information #ad
To ensure complete protection make sure to place one on each level of your home and in each bedroom. First alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 Based on a First Alert Brand Trust Survey in February 2018. Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety. Equipped with an ionization sensor, this smoke alarm reliably detects smoke from fast flaming fires and alerts you with an 85 decibel alarm.
Brand | FIRST ALERT #ad |
Manufacturer | First Alert #ad |
Height | 2.2 Inches |
Length | 5.6 Inches |
Weight | 0.05 Pounds |
Width | 5.6 Inches |
Part Number | 9120BFF |
Model | 9120B |
Warranty | 10 Year Limited |
More information #ad
5. FIRST ALERT
#ad
FIRST ALERT BRK SC7010B-3 Hardwired Smoke and Carbon Monoxide CO Detector with Battery Backup, 3-Pack
#adFIRST ALERT #ad - Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety. 3 pack of 120-volt hardwired combination photoelectric smoke and electrochemical Carbon monoxide alarms with battery backup.The spread spectrum horn is a lower frequency horn that makes it easier for the elderly with normal Aged Related hearing loss to hear the horn.
More information #ad
Features convenient 2-aA battery backup, dust cover, silence/test button, 85-decibel alarm. Intuitive latching alarm feature remembers which unit initiated an alarm, while the low battery latch gives a visual indication unit is in low battery condition.Brand | FIRST ALERT #ad |
Manufacturer | First Alert #ad |
Height | 2 Inches |
Length | 5 Inches |
Weight | 0.74 Pounds |
Width | 5 Inches |
Part Number | SC7010BFF-3 |
Model | BRK SC7010B-3 |
More information #ad
6. FIRST ALERT
#ad
White, First Alert BRK SC9120LBL Hardwired Smoke and Carbon Monoxide CO Detector with 10 Year Sealed Battery Backup
#adFIRST ALERT #ad - Rigorously tested to meet UL standards, Emits T3 pattern. Indicator lights on the face of the unit display the presence of smoke or carbon monoxide, while an 85 decibel siren provides a clear, loud warning upon detection. Simple to use, with a single test/silence button; Included 10 year lithium battery features a locked drawer to prevent tampering.10-year limited warranty; equipped with end-of-life signal chirp, so you know when it’s time to replace the unit for safety. Features an electrochemical carbon monoxide sensing technology as well as intelligent smoke sensing technology to reduce nuisance alarms; Keyhole slots in the mounting bracket eliminate the need to remove the electrical box screws for installation.
More information #ad
First alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 Based on a First Alert Brand Trust Survey in February 2018. Keep your family safer with this hardwired smoke and carbon monoxide alarm; The 10 year battery backup means constant monitoring for the life of the alarm even if there's a power failure, Single button test/silence. Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety.
Brand | FIRST ALERT #ad |
Manufacturer | First Alert #ad |
Height | 5.69 Inches |
Length | 5.59 Inches |
Weight | 0.68 Pounds |
Width | 2.25 Inches |
Part Number | SC9120LBL |
Model | BRK SC9120LBL |
Warranty | 7 |
More information #ad
7. FIRST ALERT
#ad
6-Pack, First Alert BRK 9120Bff-6 Hardwired Smoke Detector with Battery Backup
#adFIRST ALERT #ad - Tamper resistant locking pins, single button silence/test and loud 85Db alarm. 120-volt ac power with 9-volt battery backup included to keep alarm functioning during power outage. 10-year limited. 6 pack of hardwired smoke alarms, includes battery backup for power outages.More information #ad
Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety. Open mounting design for easy installation with side load battery compartment for quick replacement and interconnect able up to 18 units 12 smoke, 6 co/heat/relay.Brand | FIRST ALERT #ad |
Manufacturer | First Alert #ad |
Height | 2.2 Inches |
Length | 5.6 Inches |
Weight | 0.6 Pounds |
Width | 5.6 Inches |
Part Number | 9120BFF-6 |
Model | 9120BFF-6 |
More information #ad
8. FIRST ALERT
#ad
First Alert BRK SCO2B Smoke and Carbon Monoxide CO Detector with 9V Battery , White
#adFIRST ALERT #ad - Latching alarm indicator remembers which unit initiated an alarm. Separate smoke and co detects both dangers and eliminates the need for two separate alarms.End of life signal provides Audible Notice When Alarm Needs to be Replaced. Latching alarm indicator Remembers Which Unit Initiated an Alarm. Electrochemical co sensor is the most accurate technology available. Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety.
More information #ad
Electrochemical CO Sensor is the most accurate technology available. Separate smoke and CO detects both dangers and eliminates the need for two separate alarms. It can ship within the US except New York and California. Two locking features Pins Lock Battery Drawer and/or Alarm to Base.Brand | FIRST ALERT #ad |
Manufacturer | First Alert #ad |
Height | 2 Inches |
Length | 5.6 Inches |
Weight | 0.59 Pounds |
Width | 5.6 Inches |
Part Number | SC02B |
Model | SCO2B |
Warranty | 7 Year Limited Warranty |
More information #ad
9. FIRST ALERT
#ad
FIRST ALERT SC9120B Combination Alarm with Adapter Plugs for Easy Replacement
#adFIRST ALERT #ad - 10-year limited warranty; equipped with end-of-life signal, so you know when it's time to replace the unit for your safety. Combination smoke alarm and carbon monoxide detector features electrochemical carbon monoxide sensing technology, as well as intelligent smoke sensing technology to reduce nuisance alarms.Rigorously tested to meet UL standards. Keep your family safe with this hardwired first Alert smoke and carbon monoxide alarm with a 10-year battery backup, which means constant monitoring for the life of the alarm, even if there's a power failure.
More information #ad
Indicator lights on the face of the unit display the presence of smoke or carbon monoxide, while an 85-decibel siren provides a clear, loud warning upon detection. Convenient adapter plugs makes it easy to replace existing hardwired alarms without needing to rewire. To ensure complete protection make sure to place one carbon monoxide detector on each level of your home and in each bedroom. Simple to use, with a single test/silence button; includes 10-year lithium battery with a locked drawer to prevent tampering.
Brand | FIRST ALERT #ad |
Manufacturer | First Alert #ad |
Height | 2.25 Inches |
Length | 5.75 Inches |
Weight | 0.63 Pounds |
Width | 5.75 Inches |
Part Number | 1039807 |
Model | SC9120B |
More information #ad