First Alert BRK SMI100-AC Hardwired Smoke Detector 6-Pack with Battery Backup

Overview

The First Alert BRK SMI100-AC is part of a redesigned 9120 series that prioritizes fast installation, dependable performance, and smarter operation. This 6-pack delivers coordinated protection across multiple rooms, while keeping maintenance straightforward. Each unit is a hardwired smoke detector with a built-in battery backup, so alerts can travel through the home even if the power grid falters.

What makes it stand out

Designed for installers and homeowners alike, these alarms use a gasket-less base and a side load battery compartment for quick replacement. They are 120-Volt AC interconnectable with up to 18 compatible devices, including 12 smoke alarms and 6 accessories such as bells or relays. If any unit detects smoke, the entire series can sound in unison, helping everyone in reach know about the situation.

• Six hardwired alarms with battery backup for reliable operation during outages
• Interconnect up to 18 devices (12 smoke alarms and 6 compatible accessories)
• 120-Volt AC power with included 9-volt backup battery
• Power indicators identify the alarm that triggered
• Latching alarm indicator helps locate the source in multi-room setups
• Tamper-resistant locking pins and a secure mounting bracket

Smart features that matter

Aimed at reducing nuisance alarms, the BRK SMI100-AC uses smart technology to keep alerts meaningful. The single test/silence button makes checks simple, while a dust cover helps protect the unit during renovations. The design emphasizes quick, clean installation and long-term reliability.

• Power indicators show which unit started the alarm
• Latching indicator simplifies source identification
• Single test/silence button for routine checks
• Dust cover to protect the device during construction or upgrades

Real-world use and installation tips

Imagine a multi-story home where every level benefits from coordinated alerts. During power outages, the 9-volt backup keeps the system functional. The open mounting design and easy interconnection flow support faster job-site turnarounds and reduce maintenance hassles over time.

Durability and warranty

Designed for years of virtually maintenance-free service, the BRK SMI100-AC carries a 10-year limited warranty. The combination of durable components, tamper resistance, and straightforward cleaning makes it a practical choice for households and property managers alike.