First Alert hardwired smoke alarm SMI100-AC — Precision Detection, battery backup, quick-connect retrofit

Built to meet updated industry standards, the First Alert SMI100-AC combines Precision Detection sensing technology with a quick-connect installation to replace existing hardwired units without rewiring. It offers interconnect capability so multiple compatible alarms trigger together, plus a battery backup to keep protection active during power outages. The unit also includes a visual alarm indicator to identify which detector initiated the alert.

How does this alarm reduce false alerts from cooking?

This model uses First Alert’s Precision Detection advanced sensing algorithm to distinguish between harmless cooking smoke and the particles that indicate a real fire risk. That reduces nuisance alarms while preserving sensitivity to dangerous conditions.

• Precision Detection sensing tuned for common household aerosols
• Fewer unnecessary silences or removals near kitchens
• Maintains prompt response to larger, dangerous smoke signatures

What does interconnect capability mean for home safety?

Interconnect lets this alarm communicate with other compatible First Alert devices so that when one unit senses danger, all interconnected units sound simultaneously. This provides clearer, earlier notification across the whole house—especially helpful in larger homes or multi-level layouts.

• Wired interconnect supports whole-home alerting
• Compatible with other First Alert interconnected models
• Speeds occupant awareness in distant rooms or upper/lower floors

Is it easy to install and what about power reliability?

The SMI100-AC includes a Quick Connect plug designed to make replacement straightforward without running new wiring, reducing installation time. It’s a hardwired unit for continuous mains power and includes a replaceable battery backup to keep the alarm working during outages.

• Quick Connect plug for fast retrofit installation
• Mains-powered for constant operation with battery backup
• Visual indicator shows which unit triggered the alarm

How will I know which detector triggered the alert?

The alarm features a dedicated visual indicator that points to the specific unit that initiated the alarm event. This helps occupants and first responders locate the source quickly and reduces confusion during an emergency response.

• Clear visual alarm indicator on the unit housing
• Simplifies locating the alarm source in multi-unit systems
• Useful for maintenance and troubleshooting after an event

Who is this for: The First Alert SMI100-AC is aimed at homeowners and renters who need a reliable, code-compliant hardwired smoke detector that’s easy to retrofit, reduces kitchen false alarms, and works as part of a whole-home interconnected system. It’s especially appropriate for multi-level houses, property managers updating older systems, and anyone who wants continuous mains power with battery backup for peace of mind. Pairing multiple compatible First Alert units creates a coordinated detection network that improves notification across living spaces without complicated rewiring.