First Alert SMI100-AC Smoke Detector
First Alert

First Alert SMI100-AC Smoke Detector

4.5

Best hardwired safety solution for homeowners seeking easy installation.

This hardwired unit is the set-it-and-forget-it standard for home safety. By tapping directly into your electrical system, it eliminates the anxiety of dead batteries, while the photoelectric sensor offers superior detection for the most common types of household fires. It is the reliable, invisible guardian every home needs.

$19.99

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Detection Technology Photoelectric
Dual Sensor Ionization
Photoelectric
Power Source Hardwired, Battery Operated
Battery Operated Hardwired with Battery Backup
Hardwired, Battery Operated
Connectivity Type
Hardwired Interconnected Standalone
Interconnectivity Type
Hardwired Interconnect None

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Who it's for

  • Homeowners seeking a minimalist look that complements modern interior decor
  • Safety-conscious residents wanting uninterrupted monitoring regardless of electrical stability
  • DIY enthusiasts looking for a quick and hassle-free installation process

Who should skip it

  • Families requiring comprehensive protection against all types of fire hazards
  • Cooks who frequently use the kitchen near installed detector locations
  • Owners in older buildings without pre-existing hardwired systems

Performance breakdown

Reliability

Hardwired connection ensures constant power without relying solely on battery life.

Excellent

Detection Accuracy

Photoelectric sensors excel at identifying slow-burning, smoldering fires quickly.

Excellent

Installation Ease

Requires basic electrical knowledge, making it slightly more involved than battery-only units.

Good

Maintenance Simplicity

Standard 9V battery backup is easy to swap during routine checks.

Excellent

Design Integration

Low-profile white housing disappears seamlessly into standard ceiling and wall finishes.

Excellent

Safety Versatility

Lacks carbon monoxide detection, limiting its role to fire safety only.

Good

Key Specs

Power Source

Hardwired (120V) with Battery Backup

Detection Technology

Photoelectric

Battery Type

9V (Included)

Mounting Type

Ceiling or Wall

Carbon Monoxide Detection

No

Know before you buy

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First Alert SMI100-AC Smoke Detector

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