Best First Alert Smoke Alarms Updated February 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 First Alert Smoke Alarms
2026 Buyer's GuideUpdated February 2026
Sort by:
1

10.0

First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 3-Pack
Ease of installation
Functionality
Smoke detector quality
Value for money
Replacement value
Fit

10.0

1
First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 3-Pack
Ease of installation
Functionality
Smoke detector quality
Value for money
Replacement value
Fit

10.0

1
First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 3-Pack
Ease of installation
Functionality
Smoke detector quality
Value for money
Replacement value
Fit
2

9.9

First Alert SMI100, Battery-Operated Smoke Alarm, 3-Pack
Smoke detector quality
Ease of installation
Value for money

9.9

2
First Alert SMI100, Battery-Operated Smoke Alarm, 3-Pack
Smoke detector quality
Ease of installation
Value for money

9.9

2
First Alert SMI100, Battery-Operated Smoke Alarm, 3-Pack
Available in:  3 sizes
Smoke detector quality
Ease of installation
Value for money
3

9.7

First Alert Smoke Alarm, Interconnect Hardwire Detector with Battery Backup, SMI100-AC, 3-Pack
Ease of installation
Functionality
Smoke detector quality
Value for money
Replacement value
Fit

9.7

3
First Alert Smoke Alarm, Interconnect Hardwire Detector with Battery Backup, SMI100-AC, 3-Pack
Ease of installation
Functionality
Smoke detector quality
Value for money
Replacement value
Fit

9.7

3
First Alert Smoke Alarm, Interconnect Hardwire Detector with Battery Backup, SMI100-AC, 3-Pack
Ease of installation
Functionality
Smoke detector quality
Value for money
Replacement value
Fit
4

9.5

First Alert Smoke Alarm, Battery-Operated Detector with Test & Silence Button, SMI100, 1-Pack
Smoke detector quality
Ease of installation
Value for money

9.5

4
First Alert Smoke Alarm, Battery-Operated Detector with Test & Silence Button, SMI100, 1-Pack
Smoke detector quality
Ease of installation
Value for money

9.5

4
First Alert Smoke Alarm, Battery-Operated Detector with Test & Silence Button, SMI100, 1-Pack
Available in:  3 sizes
Smoke detector quality
Ease of installation
Value for money
5

9.4

First Alert SMI100, Battery-Operated Smoke Alarm, 2-Pack
Smoke detector quality
Ease of installation
Value for money

9.4

5
First Alert SMI100, Battery-Operated Smoke Alarm, 2-Pack
Smoke detector quality
Ease of installation
Value for money

9.4

5
First Alert SMI100, Battery-Operated Smoke Alarm, 2-Pack
Available in:  3 sizes
Smoke detector quality
Ease of installation
Value for money
6

9.2

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

9.2

6
First Alert Combination Smoke & Carbon Monoxide Alarm, Battery Operated Detector with Test & Silence Button, SMICO100, 1-Pack
Ease of installation

9.2

6
First Alert Combination Smoke & Carbon Monoxide Alarm, Battery Operated Detector with Test & Silence Button, SMICO100, 1-Pack
Available in:  4 sizes
Ease of installation
7

9.1

First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack
Ease of installation
Functionality
Smoke detector quality
Value for money
Replacement value
Fit

9.1

7
First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack
Ease of installation
Functionality
Smoke detector quality
Value for money
Replacement value
Fit

9.1

7
First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack
Ease of installation
Functionality
Smoke detector quality
Value for money
Replacement value
Fit
8

8.9

First Alert Smoke Alarm, 10-Year Sealed Battery Detector with Test & Silence Button, SMI110, 1-Pack
Ease of installation
Smoke detector quality
Value for money

8.9

8
First Alert Smoke Alarm, 10-Year Sealed Battery Detector with Test & Silence Button, SMI110, 1-Pack
Ease of installation
Smoke detector quality
Value for money

8.9

8
First Alert Smoke Alarm, 10-Year Sealed Battery Detector with Test & Silence Button, SMI110, 1-Pack
Available in:  2 styles 2 options
Ease of installation
Smoke detector quality
Value for money
9

8.7

First Alert SMI105-AC, Interconnect Hardwire Smoke Alarm with 10-Year Battery Backup, 1-Pack
Ease of installation
Smoke detector quality
Value for money
Fit

8.7

9
First Alert SMI105-AC, Interconnect Hardwire Smoke Alarm with 10-Year Battery Backup, 1-Pack
Ease of installation
Smoke detector quality
Value for money
Fit

8.7

9
First Alert SMI105-AC, Interconnect Hardwire Smoke Alarm with 10-Year Battery Backup, 1-Pack
Available in:  2 sizes
Ease of installation
Smoke detector quality
Value for money
Fit
10

8.5

First Alert SMICO110, 10-Year Battery Combination Smoke & Carbon Monoxide Alarm, 1-Pack
Smoke alarm quality
Ease of installation
Value for money

8.5

10
First Alert SMICO110, 10-Year Battery Combination Smoke & Carbon Monoxide Alarm, 1-Pack
Smoke alarm quality
Ease of installation
Value for money

8.5

10
First Alert SMICO110, 10-Year Battery Combination Smoke & Carbon Monoxide Alarm, 1-Pack
Smoke alarm quality
Ease of installation
Value for money

Our Top Choice

1

10.0

First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 3-Pack
Ease of installation
Functionality
Smoke detector quality
Value for money
Replacement value
Fit

10.0

1
First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 3-Pack
Ease of installation
Functionality
Smoke detector quality
Value for money
Replacement value
Fit

10.0

1
First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 3-Pack
Ease of installation
Functionality
Smoke detector quality
Value for money
Replacement value
Fit