Best Smoke Detector CO Combos Updated May 2026

Join the millions that have trusted BuyersGuide.org to help them make smarter buying decisions. Let our independent expert reviews and data-driven shopping recommendations help you find the one that's right for you.

Best Smoke Detector CO Combos
2026 Buyer's GuideUpdated May 2026
Sort by:
1

10.0

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

10.0

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

10.0

1
First Alert SMCO210, 10-Year Sealed Battery Combination Smoke & Carbon Monoxide Alarm with Slim Profile Design, 1-Pack
Ease of installation
2

9.9

Kidde Smoke & Carbon Monoxide Detector, AA Battery Powered, LED Warning Light Indicators, 2 Pack
Installation
Quality
Value for money
Safety

9.9

2
Kidde Smoke & Carbon Monoxide Detector, AA Battery Powered, LED Warning Light Indicators, 2 Pack
Installation
Quality
Value for money
Safety

9.9

2
Kidde Smoke & Carbon Monoxide Detector, AA Battery Powered, LED Warning Light Indicators, 2 Pack
Installation
Quality
Value for money
Safety
3

9.7

Kidde Smoke & Carbon Monoxide Detector, AA Battery Powered, LED Warning Light Indicators, 1 Pack
Installation
Quality
Value for money

9.7

3
Kidde Smoke & Carbon Monoxide Detector, AA Battery Powered, LED Warning Light Indicators, 1 Pack
Installation
Quality
Value for money

9.7

3
Kidde Smoke & Carbon Monoxide Detector, AA Battery Powered, LED Warning Light Indicators, 1 Pack
Installation
Quality
Value for money
4

9.4

First Alert BRK Combination Smoke & Carbon Monoxide Alarm, Battery Operated Detector with Test & Silence Button, SMICO100, 1-Pa...
Ease of installation
Functionality

9.4

4
First Alert BRK Combination Smoke & Carbon Monoxide Alarm, Battery Operated Detector with Test & Silence Button, SMICO100, 1-Pa...
Ease of installation
Functionality

9.4

4
First Alert BRK Combination Smoke & Carbon Monoxide Alarm, Battery Operated Detector with Test & Silence Button, SMICO100, 1-Pa...
Ease of installation
Functionality
5

9.3

Kidde Smoke and Carbon Monoxide Detector, 10-Year Battery Powered, LED Status Lights, 85 dB Alarm, 5-inches, 30CUD10, 1 Pack
Installation

9.3

5
Kidde Smoke and Carbon Monoxide Detector, 10-Year Battery Powered, LED Status Lights, 85 dB Alarm, 5-inches, 30CUD10, 1 Pack
Installation

9.3

5
Kidde Smoke and Carbon Monoxide Detector, 10-Year Battery Powered, LED Status Lights, 85 dB Alarm, 5-inches, 30CUD10, 1 Pack
Installation
6

9.1

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

9.1

6
Kidde Smoke Detector & Carbon Monoxide Detector Combo with 10-Year Battery,‎White
Ease of installation

9.1

6
Kidde Smoke Detector & Carbon Monoxide Detector Combo with 10-Year Battery,‎White
Ease of installation
7

8.9

Kidde Smoke and Carbon Monoxide Detector, Hardwired with 10-Year Battery Backup, Voice Alerts, LED Status Lights, Interconnecte...
Installation
Quality
Battery life
Replacement

8.9

7
Kidde Smoke and Carbon Monoxide Detector, Hardwired with 10-Year Battery Backup, Voice Alerts, LED Status Lights, Interconnecte...
Installation
Quality
Battery life
Replacement

8.9

7
Kidde Smoke and Carbon Monoxide Detector, Hardwired with 10-Year Battery Backup, Voice Alerts, LED Status Lights, Interconnecte...
Installation
Quality
Battery life
Replacement
8

8.6

FIRST ALERT BRK SC9120FF Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup, 1 pack , White
Installation
Functionality
Quality
Value for money
Replacement
Wired

8.6

8
FIRST ALERT BRK SC9120FF Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup, 1 pack , White
Installation
Functionality
Quality
Value for money
Replacement
Wired

8.6

8
FIRST ALERT BRK SC9120FF Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup, 1 pack , White
Installation
Functionality
Quality
Value for money
Replacement
Wired
9

8.4

Kidde Carbon Monoxide Detector, AA Battery Powered CO Alarm with LEDs, Test-Reset Button, Low Battery Indicator, Portable
Reliability
Easy to install
Quality
Value for money
Safety
Battery

8.4

9
Kidde Carbon Monoxide Detector, AA Battery Powered CO Alarm with LEDs, Test-Reset Button, Low Battery Indicator, Portable
Reliability
Easy to install
Quality
Value for money
Safety
Battery

8.4

9
Kidde Carbon Monoxide Detector, AA Battery Powered CO Alarm with LEDs, Test-Reset Button, Low Battery Indicator, Portable
Available in:  2 styles
Reliability
Easy to install
Quality
Value for money
Safety
Battery
10

8.2

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

8.2

10
First Alert Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector with Battery Backup, SMICO100-AC, 1-Pack
Replacement
Installation

8.2

10
First Alert Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector with Battery Backup, SMICO100-AC, 1-Pack
Replacement
Installation

Our Top Choice

1

10.0

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

10.0

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

10.0

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

Choosing between many options can be difficult. This guide compiles essential product details, feature comparisons, and up-to-date market data into a single, easy-to-scan view. Rankings are determined by performance factors, product popularity, and continuous analysis across available models, making it simple to compare and select the right fit. Results come from side-by-side comparisons within each category, highlighting the features that matter most. Rankings are refreshed regularly as new data and shopping trends evolve, helping surface strong-performing products and keep recommendations current.