First Alert BRK SMI100-AC Hardwired Smoke Alarm with Battery Backup

Overview

The First Alert BRK SMI100-AC Hardwired Smoke Alarm with Battery Backup delivers dependable protection for homes and apartments. It runs on 120-Volt AC power and includes a built-in 9-Volt battery to keep the alarm active during power outages. The compact unit is designed for ceiling mounting, with straightforward controls that make routine testing and silencing simple.

Key benefits at a glance

• Hardwired 120V operation with a ready-to-use battery backup for continuous protection
• Ionization sensing targets fast, flaming fires often associated with cooking or electrical faults
• Piercing 85 dB alarm to wake bedrooms and living areas quickly
• Tamper-resistant locking pins help deter unwanted removal
• Single-button silence and test simplify maintenance and verification

Sensor performance and real-world use

The ionization sensor is tuned for rapid detection of smoke from hot, fast-flaming fires, providing a clear alarm without delay. In everyday life this translates to a reliable alert during late-night cooking accidents or electrical faults, helping households respond promptly while minimizing false alarms.

With 85 dB of sound, the alarm is designed to be audible throughout common living spaces, including bedrooms, kitchens, and hallways. The combination of hardwired power and battery backup means the device remains active if a local outage occurs, supporting ongoing safety during critical moments.

Installation notes and best practices

When wiring a BRK SMI100-AC, verify that the polarity is correct and all wire-nut connections are secure in the junction box. A loose neutral (white wire) could prompt a device malfunction, so take care to confirm solid connections during setup.

• Ensure proper mounting on the ceiling for optimal detection coverage
• Confirm the backup battery is present and accessible for routine checks

Who benefits and how it fits into safety routines

Families with children or pets, as well as occupants in multi-room homes, gain a consistent and loud alert when danger is present. The silence/test feature supports regular maintenance without compromising alert readiness, and the battery backup provides a fail-safe in case of a power disturbance.

Overall, the BRK SMI100-AC offers a practical balance of reliable hardwired protection and straightforward operation. It aims to support informed safety practices in daily life while avoiding claims beyond what the data indicates.