First Alert 3120B Smoke Alarm
Best dual sensor protection for safety conscious homeowners.
This dual-sensor alarm is the gold standard for comprehensive home safety, catching both fast-flaming and slow-smoldering fires that single-sensor models often miss. It requires a hardwired installation, which is more involved than a simple battery-powered unit, but the trade-off is the peace of mind that comes with truly reliable, continuous protection.
$45.43
at
Toolbox Supply
More 3100 Series options
Who it's for
- Safety-conscious homeowners seeking comprehensive fire detection for every room
- Residents in areas prone to power fluctuations or outages
- Home cooks who frequently trigger false alarms in the kitchen
Who should skip it
- DIY beginners uncomfortable working with high-voltage electrical wiring
- Busy individuals who prefer a maintenance-free, long-term battery solution
- Homeowners with existing non-First Alert alarm systems looking for compatibility
Performance breakdown
Detection Versatility
Dual-sensor technology captures both fast-flaming and slow-smoldering fires effectively.
Power Reliability
Hardwired connection paired with battery backup ensures constant, uninterrupted monitoring.
Ease of Maintenance
Single-button interface makes testing and silencing false alarms straightforward.
System Integration
Interconnect capability allows for a synchronized, whole-home safety network.
Detection Speed
360-degree smoke entry points minimize delay in identifying potential hazards.
Build Quality
Robust construction meets rigorous safety standards for long-term residential reliability.
Key Specs
Detection Technology
Dual Sensor (Photoelectric and Ionization)
Power Source
120V Hardwired with Battery Backup
Battery Type
AA
Alarm Sound Level
85 dB
Interconnectivity Type
Hardwired Interconnect
Mounting Type
Ceiling or Wall Mount
Certification
UL Listed, ETL Listed
Hush Button Feature
Included
Alert Type
Siren / Beep
Alarm Type
Siren
Know before you buy
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