Best First Alert Smoke Alarms Updated February 2026
Advertiser disclosure About our rankings

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
Advertiser disclosure About our rankings
Sort by:
Best First Alert Smoke Alarm
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
Save 29%
3K+ bought in past month
Best First Alert Smoke Alarm

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
3K+ bought in past month
Save 29%
Best First Alert Smoke Alarm

10.0

1
First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 3-Pack
Available in:  2 styles ,  4 sizes ,  3 options
Ease of installation
Functionality
Smoke detector quality
Value for money
Replacement value
Fit
3K+ bought in past month
Save 29%
Premium Pick
2

9.9

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

9.9

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

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
Save 30%

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
Save 30%

9.7

3
First Alert Smoke Alarm, Interconnect Hardwire Detector with Battery Backup, SMI100-AC, 3-Pack
Available in:  2 styles ,  4 sizes ,  3 options
Ease of installation
Functionality
Smoke detector quality
Value for money
Replacement value
Fit
Save 30%
Best Value
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
Save 15%
Best Value

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
Save 15%
Best Value

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
Save 15%
Popular
5

9.4

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

9.4

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

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
Save 11%

9.2

6
First Alert Combination Smoke & Carbon Monoxide Alarm, Battery Operated Detector with Test & Silence Button, SMICO100, 1-Pack
Ease of installation
Save 11%

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
Save 11%
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
Save 34%

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
Save 34%

9.1

7
First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack
Available in:  4 sizes ,  2 styles ,  3 options
Ease of installation
Functionality
Smoke detector quality
Value for money
Replacement value
Fit
Save 34%
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
Save 18%

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
Save 18%

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
Save 18%
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
Save 10%

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
Save 10%

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
Save 10%

Our Top Choice

Best First Alert Smoke Alarm
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
Save 29%
3K+ bought in past month
Best First Alert Smoke Alarm

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
3K+ bought in past month
Save 29%
Best First Alert Smoke Alarm

10.0

1
First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 3-Pack
Available in:  2 styles ,  4 sizes ,  3 options
Ease of installation
Functionality
Smoke detector quality
Value for money
Replacement value
Fit
3K+ bought in past month
Save 29%
Related Categories
Residential Smoke DetectorBattery Powered Smoke AlarmHardwired Smoke AlarmFirst Alert 9120B Smoke DetectorX-Sense Smoke AlarmFirst Alert Fire Alarm
How We Rank
Expert Analysis
Our team of experts highlights useful information so you can easily compare products to find the one that's right for you.

Award-Winning Tech
Our technology analyzes thousands of purchase trends to bring you the top product recommendations.

Why Trust Our Reviews?
1,000,000+ shoppers use Buyer's Guide every week to find the best products and services online.

Learn more about our rankings.

Reliable, Safe & Secure
Helping millions of users make smarter purchases online.
Related Categories
Residential Smoke DetectorBattery Powered Smoke AlarmHardwired Smoke AlarmFirst Alert 9120B Smoke DetectorX-Sense Smoke AlarmFirst Alert Fire Alarm
Related Categories
Residential Smoke DetectorBattery Powered Smoke AlarmHardwired Smoke AlarmFirst Alert 9120B Smoke DetectorX-Sense Smoke AlarmFirst Alert Fire Alarm