May 25, 2026

10 Best Best Carbon Monoxide And Smoke Detector Combo of 2026

Last Updated - May 25, 2026

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Up to 27% off

1

9.9

Outstanding

X-Sense Smoke Detector Carbon Monoxide Detector Combo, 10-Year Battery Smoke Detector with Display, UL 217 & UL 2034 Certified, Model SC01, 3-Pack

X-Sense

Clicked 397 times in the last week

X-Sense Smoke Detector Carbon Monoxide Detector Combo, 10-Year Battery Smoke Detector with Display, UL 217 & UL 2034 Certified, Model SC01, 3-Pack

Why We Love It

10-Year Battery Smoke and CO Detector: Provides 10 years of continuous power with a built-in lithium battery; saves you from battery replacement
2-in-1 Protection: The smoke and carbon monoxide detector is equipped with both photoelectric smoke sensor and electrochemical CO sensor that both detect smoke and dangerous CO levels
ETL Listed: The smoke and carbon monoxide alarm meets the UL 217 & UL 2034 safety standards for your peace of mind and absolute confidence in our product
Simple Installation: Requires no rewiring; easy to mount this fire and CO alarm on any wall or ceiling with the included mounting bracket, screws and anchor plugs
Combination Alarm with CO Readings: the large LCD display clearly indicates real-time carbon monoxide (CO) levels in the surrounding air, as well as its battery level and working status

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Why We Love It

10-Year Battery Smoke and CO Detector: Provides 10 years of continuous power with a built-in lithium battery; saves you from battery replacement
2-in-1 Protection: The smoke and carbon monoxide detector is equipped with both photoelectric smoke sensor and electrochemical CO sensor that both detect smoke and dangerous CO levels
ETL Listed: The smoke and carbon monoxide alarm meets the UL 217 & UL 2034 safety standards for your peace of mind and absolute confidence in our product
Simple Installation: Requires no rewiring; easy to mount this fire and CO alarm on any wall or ceiling with the included mounting bracket, screws and anchor plugs
Combination Alarm with CO Readings: the large LCD display clearly indicates real-time carbon monoxide (CO) levels in the surrounding air, as well as its battery level and working status

2

9.5

Excellent

First Alert

First Alert SMCO210, 10-Year Sealed Battery Combination Smoke & Carbon Monoxide Alarm with Slim Profile Design, 1-Pack

Main Highlights

First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency.
Provides reliable 2-in-1 protection against both smoke and carbon monoxide in an easy to install alarm
10-Year sealed battery eliminates battery replacements and low battery chirps for the life of the alarm
End-of-life warning lets you know when its time to replace the alarm
Slim profile design is half the depth of a standard alarm

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Main Highlights

First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency.
Provides reliable 2-in-1 protection against both smoke and carbon monoxide in an easy to install alarm
10-Year sealed battery eliminates battery replacements and low battery chirps for the life of the alarm
End-of-life warning lets you know when its time to replace the alarm
Slim profile design is half the depth of a standard alarm

3

9.5

Excellent

First Alert BRK Combination Smoke & Carbon Monoxide Alarm, Battery Operated Detector with Test & Silence Button, SMICO100, 1-Pack

First Alert

First Alert BRK Combination Smoke & Carbon Monoxide Alarm, Battery Operated Detector with Test & Silence Button, SMICO100, 1-Pack

Main Highlights

First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency
Provides reliable 2-in-1 protection against both smoke and carbon monoxide
End-of-life warning lets you know when its time to replace the alarm
Battery-operated alarm allows for easy installation and maintenance
Test/silence button for efficient testing to ensure alarm is working properly

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Main Highlights

First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency
Provides reliable 2-in-1 protection against both smoke and carbon monoxide
End-of-life warning lets you know when its time to replace the alarm
Battery-operated alarm allows for easy installation and maintenance
Test/silence button for efficient testing to ensure alarm is working properly

4

9.2

Excellent

Kidde Smoke and Carbon Monoxide Detector, AA Battery Powered with LED Status Lights, 85 dB Alarm, 5 inches, 30CUDR, 3 Pack

Kidde

Kidde Smoke and Carbon Monoxide Detector, AA Battery Powered with LED Status Lights, 85 dB Alarm, 5 inches, 30CUDR, 3 Pack

Main Highlights

2-in-1 DETECTION: Model 30CUDR detects both smoke and carbon monoxide and features advanced sensing technology with over 25% faster smoke detection*; sounds a loud 85-decibel alarm with red LED light for clear visual warnings; suitable for homes
AA BATTERY OPERATION & WARRANTY: Powered by two AA batteries (included) for easy, no-wiring setup . Backed by 10-year limited warranty** that starts from date of purchase
REDUCED FALSE ALARMS: Uses advanced sensing technology that helps distinguish between real smoke and everyday cooking or steam; helps reduce false alarms while maintaining quick, accurate detection when smoke is present
TESTED FOR RELIABILITY & COMPLIANCE: Rigorously tested to meet UL 217 10th Edition, UL 2034 5th Edition, and FCC standards for performance and safety; enhanced sensing technology helps reduce false alarms from everyday cooking or steam
BUILT FOR HOMEOWNERS AND PROFESSIONALS: Designed for those who prioritize dependable, code-compliant detection; supports safety goals for homeowners, property managers, contractors, and professionals seeking long-term home safety assurance

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Main Highlights

2-in-1 DETECTION: Model 30CUDR detects both smoke and carbon monoxide and features advanced sensing technology with over 25% faster smoke detection*; sounds a loud 85-decibel alarm with red LED light for clear visual warnings; suitable for homes
AA BATTERY OPERATION & WARRANTY: Powered by two AA batteries (included) for easy, no-wiring setup . Backed by 10-year limited warranty** that starts from date of purchase
REDUCED FALSE ALARMS: Uses advanced sensing technology that helps distinguish between real smoke and everyday cooking or steam; helps reduce false alarms while maintaining quick, accurate detection when smoke is present
TESTED FOR RELIABILITY & COMPLIANCE: Rigorously tested to meet UL 217 10th Edition, UL 2034 5th Edition, and FCC standards for performance and safety; enhanced sensing technology helps reduce false alarms from everyday cooking or steam
BUILT FOR HOMEOWNERS AND PROFESSIONALS: Designed for those who prioritize dependable, code-compliant detection; supports safety goals for homeowners, property managers, contractors, and professionals seeking long-term home safety assurance

5

9.0

Excellent

First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup, 6-Pack

First Alert

First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup, 6-Pack

Main Highlights

BRK's Precision Detection advanced sensing technology reduces cooking nuisance alarms and delivers early warning
Interconnects with most First Alert and BRK alarms so when one sounds, all compatible alarms sound to provide an early warning
Battery backup provides continuous protection during power outages
Perfect mount bracket keeps the alarm secure over a wide rotation range for ideal alignment and easy installation
Latching Alarm Indicator visually identifies the unit that initiated the alarm or low battery warning

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Main Highlights

BRK's Precision Detection advanced sensing technology reduces cooking nuisance alarms and delivers early warning
Interconnects with most First Alert and BRK alarms so when one sounds, all compatible alarms sound to provide an early warning
Battery backup provides continuous protection during power outages
Perfect mount bracket keeps the alarm secure over a wide rotation range for ideal alignment and easy installation
Latching Alarm Indicator visually identifies the unit that initiated the alarm or low battery warning

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6

8.8

Very Good

Kidde Smoke and Carbon Monoxide Detector, AA Battery Powered with LED Status Lights, 85 dB Alarm, 5 inches, 30CUDR, 1 Pack

Kidde

Kidde Smoke and Carbon Monoxide Detector, AA Battery Powered with LED Status Lights, 85 dB Alarm, 5 inches, 30CUDR, 1 Pack

Main Highlights

2-in-1 DETECTION: Model 30CUDR detects both smoke and carbon monoxide and features advanced sensing technology with over 25% faster smoke detection*; sounds a loud 85-decibel alarm with red LED light for clear visual warnings; suitable for homes
AA BATTERY OPERATION & WARRANTY: Powered by two AA batteries (included) for easy, no-wiring setup . Backed by 10-year limited warranty** that starts from date of purchase
REDUCED FALSE ALARMS: Uses advanced sensing technology that helps distinguish between real smoke and everyday cooking or steam; helps reduce false alarms while maintaining quick, accurate detection when smoke is present
TESTED FOR RELIABILITY & COMPLIANCE: Rigorously tested to meet UL 217 10th Edition, UL 2034 5th Edition, and FCC standards for performance and safety; enhanced sensing technology helps reduce false alarms from everyday cooking or steam
BUILT FOR HOMEOWNERS AND PROFESSIONALS: Designed for those who prioritize dependable, code-compliant detection; supports safety goals for homeowners, property managers, contractors, and professionals seeking long-term home safety assurance

View Deal on:

Main Highlights

2-in-1 DETECTION: Model 30CUDR detects both smoke and carbon monoxide and features advanced sensing technology with over 25% faster smoke detection*; sounds a loud 85-decibel alarm with red LED light for clear visual warnings; suitable for homes
AA BATTERY OPERATION & WARRANTY: Powered by two AA batteries (included) for easy, no-wiring setup . Backed by 10-year limited warranty** that starts from date of purchase
REDUCED FALSE ALARMS: Uses advanced sensing technology that helps distinguish between real smoke and everyday cooking or steam; helps reduce false alarms while maintaining quick, accurate detection when smoke is present
TESTED FOR RELIABILITY & COMPLIANCE: Rigorously tested to meet UL 217 10th Edition, UL 2034 5th Edition, and FCC standards for performance and safety; enhanced sensing technology helps reduce false alarms from everyday cooking or steam
BUILT FOR HOMEOWNERS AND PROFESSIONALS: Designed for those who prioritize dependable, code-compliant detection; supports safety goals for homeowners, property managers, contractors, and professionals seeking long-term home safety assurance

7

8.6

Very Good

Kidde Smoke Detector & Carbon Monoxide Detector Combo with 10-Year Battery,‎White

Kidde

Kidde Smoke Detector & Carbon Monoxide Detector Combo with 10-Year Battery,‎White

Main Highlights

2-in-1 Detection - Smoke & carbon monoxide detector combo alerts you to both smoke & fire events as well as poisonous, CO gas in a single device
Photoelectric sensor detects visible fire particles associated with slow, smoldering fires, while the electrochemical sensor detects carbon monoxide
An 85-decibel alarm sounds & a red LED indicates the smoke detector is sensing smoke or fire
Lithium battery operated: eliminates the need for battery replacement & provides reliable detection, even during power outages
Test-Hush button makes it easy to test the smoke detector and silence false alarms that occur from cooking or shower steam
The alarm will automatically activate when it is attached to the mounting bracket, there are no pull tabs, no switches, everything is automatic
At the end of alarm life, the unit will chirp, indicating the alarm is in need of replacement
UL listed with a 10-Year limited manufacturer warranty on the alarm only (not a battery performance claim). Warranty begins when the alarm is powered on. If that date is unknown, it should be assumed that replacement is needed.

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Main Highlights

2-in-1 Detection - Smoke & carbon monoxide detector combo alerts you to both smoke & fire events as well as poisonous, CO gas in a single device
Photoelectric sensor detects visible fire particles associated with slow, smoldering fires, while the electrochemical sensor detects carbon monoxide
An 85-decibel alarm sounds & a red LED indicates the smoke detector is sensing smoke or fire
Lithium battery operated: eliminates the need for battery replacement & provides reliable detection, even during power outages
Test-Hush button makes it easy to test the smoke detector and silence false alarms that occur from cooking or shower steam
The alarm will automatically activate when it is attached to the mounting bracket, there are no pull tabs, no switches, everything is automatic
At the end of alarm life, the unit will chirp, indicating the alarm is in need of replacement
UL listed with a 10-Year limited manufacturer warranty on the alarm only (not a battery performance claim). Warranty begins when the alarm is powered on. If that date is unknown, it should be assumed that replacement is needed.

8

8.3

Very Good

X-Sense 10-Year Battery Combination Smoke Carbon Monoxide Alarm Detector with Large LCD Display, Certified to UL 217 9th Edition, Standalone Model SC07, 1-Pack

X-Sense

X-Sense 10-Year Battery Combination Smoke Carbon Monoxide Alarm Detector with Large LCD Display, Certified to UL 217 9th Edition, Standalone Model SC07, 1-Pack

Main Highlights

Please Note: SC07 is a basic standalone unit; it does not support wireless interconnection, does not have Wi-Fi, and cannot be used with a base station; for interconnection, search for SC07-W
2-in-1 Protection: The combination detector detects faster and more accurately using a photoelectric smoke sensor and an electrochemical CO sensor; tested and certified to meet UL 217 and UL 2034 safety standards
10-Year Battery: The fire and CO alarm is built with a sealed lithium battery that provides 10 years of continuous power, saving you from changing batteries and power outage
Simple Installation: Requires no rewiring; easy to mount this smoke and carbon monoxide alarm on any wall or ceiling with the included mounting bracket, screws, and anchor plugs
Informative LCD: Displays real-time CO levels from 30999 ppm (parts per million) taken from the surrounding air, as well as battery level and working status

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Main Highlights

Please Note: SC07 is a basic standalone unit; it does not support wireless interconnection, does not have Wi-Fi, and cannot be used with a base station; for interconnection, search for SC07-W
2-in-1 Protection: The combination detector detects faster and more accurately using a photoelectric smoke sensor and an electrochemical CO sensor; tested and certified to meet UL 217 and UL 2034 safety standards
10-Year Battery: The fire and CO alarm is built with a sealed lithium battery that provides 10 years of continuous power, saving you from changing batteries and power outage
Simple Installation: Requires no rewiring; easy to mount this smoke and carbon monoxide alarm on any wall or ceiling with the included mounting bracket, screws, and anchor plugs
Informative LCD: Displays real-time CO levels from 30999 ppm (parts per million) taken from the surrounding air, as well as battery level and working status

9

8.1

Very Good

Kidde Smoke & Carbon Monoxide Detector Combo, 10-Year Battery, Replacement Alert, 4 Count (Pack of 1)

Kidde

Kidde Smoke & Carbon Monoxide Detector Combo, 10-Year Battery, Replacement Alert, 4 Count (Pack of 1)

Main Highlights

2-in-1 Detection - Smoke & carbon monoxide detector combo alerts you to both smoke & fire events as well as poisonous, CO gas in a single device
Photoelectric sensor detects visible fire particles associated with slow, smoldering fires, while the electrochemical sensor detects carbon monoxide
An 85-decibel alarm sounds & a red LED indicates the smoke detector is sensing smoke or fire
Lithium battery operated: eliminates the need for battery replacement & provides reliable detection, even during power outages
Test-Hush button makes it easy to test the smoke detector and silence false alarms that occur from cooking or shower steam
The alarm will automatically activate when it is attached to the mounting bracket, there are no pull tabs, no switches, everything is automatic
At the end of alarm life, the unit will chirp, indicating the alarm is in need of replacement
UL listed with a 10-Year limited manufacturer warranty on the alarm only (not a battery performance claim). Warranty begins when the alarm is powered on. If that date is unknown, it should be assumed that replacement is needed.

View Deal on:

Main Highlights

2-in-1 Detection - Smoke & carbon monoxide detector combo alerts you to both smoke & fire events as well as poisonous, CO gas in a single device
Photoelectric sensor detects visible fire particles associated with slow, smoldering fires, while the electrochemical sensor detects carbon monoxide
An 85-decibel alarm sounds & a red LED indicates the smoke detector is sensing smoke or fire
Lithium battery operated: eliminates the need for battery replacement & provides reliable detection, even during power outages
Test-Hush button makes it easy to test the smoke detector and silence false alarms that occur from cooking or shower steam
The alarm will automatically activate when it is attached to the mounting bracket, there are no pull tabs, no switches, everything is automatic
At the end of alarm life, the unit will chirp, indicating the alarm is in need of replacement
UL listed with a 10-Year limited manufacturer warranty on the alarm only (not a battery performance claim). Warranty begins when the alarm is powered on. If that date is unknown, it should be assumed that replacement is needed.

10

8.1

Very Good

First Alert Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector with Battery Backup, SMICO100-AC, 1-Pack

First Alert

First Alert Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector with Battery Backup, SMICO100-AC, 1-Pack

Main Highlights

First Alerts Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency
Through early warning interconnect, when one alarm sounds, all compatible
Quick Connect Plug allows for easy installation with no need to rewire
Battery backup provides continuous protection during power outages
Test/silence button for efficient testing to ensure alarm is working properly

View Deal on:

Main Highlights

First Alerts Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency
Through early warning interconnect, when one alarm sounds, all compatible
Quick Connect Plug allows for easy installation with no need to rewire
Battery backup provides continuous protection during power outages
Test/silence button for efficient testing to ensure alarm is working properly