First Alert Smoke Alarm
Best reliable safety essential for budget conscious homeowners.
This hardwired system offers the ultimate peace of mind by linking every room in your home to a single, responsive network. While installation requires a bit more effort than a simple peel-and-stick model, the reliability of a permanent power connection and battery backup makes it the gold standard for comprehensive safety.
$79.99
at
Costco
More SMI100 Series options
First Alert Smoke Alarm SMI100
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First Alert SMI100-AC
$129.95
First Alert SMI100-AC Smoke Alarm
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First Alert SMI100-AC Smoke Alarm
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First Alert SMI100 Smoke Alarm
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First Alert SMI100-AC Hardwire Smoke Alarm
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First Alert SMI100-AC Smoke Detector
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First Alert Precision Detection Interconnect Hardwired Smoke Alarm
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First Alert SMI100-AC Hardwire Interconnect Smoke Alarm
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First Alert SMI100-AC Smoke Alarm
$117.00
First Alert SMI105-AC Interconnect Hardwire Smoke Alarm
$30.99
First Alert Precision Detection Interconnect Hardwired Smoke Alarm
$34.95
First Alert SMI100-AC Smoke Alarm
$117.00
First Alert SMI105-AC Smoke Alarm
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First Alert 9120BFF/ SMI100-AC Smoke Detector
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Who it's for
- Homeowners seeking a trusted, industry-standard safety solution
- DIYers looking for a straightforward and fast setup process
- Budget-conscious families prioritizing essential safety on a limited budget
Who should skip it
- Home cooks who frequently use high-heat methods or small apartments
- Busy individuals who prefer low-maintenance, long-life lithium battery options
- Tech-savvy users wanting remote monitoring and mobile notifications
Performance breakdown
Detection Reliability
Dual sensor technology significantly reduces false alarms while ensuring rapid fire response.
System Integration
Hardwired interconnection across 18 units creates a robust, whole-home safety network.
Power Redundancy
Reliable battery backup ensures continuous protection during unexpected electrical grid failures.
Maintenance Simplicity
Integrated test and silence buttons make routine safety checks straightforward and quick.
Build Longevity
A decade-long warranty underscores the manufacturer's confidence in long-term hardware durability.
Installation Complexity
Requires existing electrical wiring, making it less accessible for DIY beginners.
Key Specs
Power Source
Hardwired with 9V Battery Backup
Detection Technology
Dual Sensor
Connectivity Type
Hardwired Interconnected
Interconnectivity Type
Hardwired Interconnect
Dimensions
5.6 inches diameter x 1.9 inches height
Weight
2 lbs
Battery Type
9V
Certification
UL217 8th Edition
Alert Type
Siren / Beep
Alarm Type
Siren
Know before you buy
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