First Alert
First Alert 3120B Smoke Alarm
4.5
Best dual sensor protection for homeowners seeking reliable hardwired safety solutions.
$19.98
Out of stock
Detection Technology
Dual Sensor
Dual Sensor
Dual Sensor, Photoelectric, Ionization
More 3100 Series options
Who it's for
- Safety-conscious homeowners seeking comprehensive fire detection for their families.
- Residents in areas prone to frequent electrical storms or grid instability.
- Families in multi-story homes requiring synchronized alerts across all rooms.
Who should skip it
- Busy individuals who prefer low-maintenance, long-term set-and-forget solutions.
- Renters or DIY novices looking for a simple, tool-free installation process.
- Home cooks with small kitchens or poor ventilation near the alarm.
Key Specs
Detection Technology
Dual Sensor (Photoelectric and Ionization)
Power Source
Hardwired with 9V battery backup
Connectivity Type
Hardwired Interconnected
Interconnectivity Type
Hardwired Interconnect
Alarm Sound Level
85 dB
Alert Type
T3 Siren / Beep
Mounting Type
Ceiling or Wall Mount
Certification
UL Listed
Hush Button Feature
Included
Dimensions
130.3 mm (H) x 131.83 mm (Diameter) x 60.45 mm (Depth)
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