First Alert BRK SC-9120B Hardwired Smoke & CO Detector with Battery Backup – 24/7 Protection

Reliable, round-the-clock protection for every room

The First Alert BRK SC-9120B combines a hardwired smoke detector with a carbon monoxide sensor and a 9V battery backup, delivering continuous coverage even during power interruptions. Designed for ease of use and long-term reliability, it helps you monitor both smoke and CO with a single, compact device.

In real-world terms, you’ll notice clear, easy-to-interpret indicators when alarms are triggered. The unit’s intelligent sensing helps keep nuisance alarms to a minimum, while its robust construction supports frequent testing and maintenance without interrupting daily life.

Key capabilities at a glance

• 24/7 protection with 120V power and a backup battery to maintain coverage when power is out
• Electrochemical CO sensor paired with dual ionization smoke sensing for broadened detection
• Inter-connectable with BRK and First Alert hardwired alarms to synchronize alerts across multiple units
• Single-button test and silence with separate indicators for smoke and CO
• 9-volt battery included; seven-year limited warranty for added peace of mind
• Advanced features silence nuisance alarms temporarily and provide an end-of-life signal for replacement needs

Easy installation and ongoing maintenance are core to this model. A large mounting bracket opening simplifies wiring access, while keyhole slots let you align the unit without removing screws from the electrical box. The battery can be installed or replaced via a side compartment, so you don’t have to detach the detector from the ceiling or wall. A battery pull tab helps keep the battery fresh until the home is occupied, and a quick-connect wiring harness speeds up setup when you’re wiring multiple devices.

Practical, real-world benefits

• Nuisance alarm reduction thanks to intelligent sensing helps you sleep through typical household fluctuations
• Distinct latching indicators clearly show whether the trigger came from smoke or CO, aiding quick response
• Two locking features deter theft in shared or rental environments
• Dust cover helps protect sensors during installation and transport, contributing to long-term reliability
• End-of-life signal audibly reminds you when replacement is due, so you stay protected

Warranty, installation notes, and care

This model includes a seven-year limited warranty and is manufactured to balance performance with accessibility. For installation, rely on a universal mounting bracket, easy-to-access wiring, and a simple testing workflow that keeps routine checks quick and non-disruptive. The unit’s design supports secure mounting and straightforward maintenance, so you can focus on everyday safety without complex setup.

Whether you’re equipping a single room or updating an entire home, the BRK SC-9120B aims to deliver dependable detection and practical features that align with typical everyday needs. Consider it as part of a layered safety approach that prioritizes real-life use, clear signals, and straightforward serviceability.