First Alert BRK SC-9120B Hardwired Smoke & Carbon Monoxide Alarm - 4-Pack

Overview

The First Alert BRK SC-9120B is a hardwired dual-sensor alarm designed to protect homes with dependable alerting. This 4-pack combines an electrochemical carbon monoxide (CO) sensor with an ionization smoke detector, delivering two detection methods in a single, compact unit. It runs on home power and includes a 9-volt backup battery to maintain protection during power outages, offering peace of mind in everyday living as well as during unexpected outages.

In real-world settings, you may place a unit on each floor or in key rooms to ensure coverage where it matters most. The result is a cohesive safety network that helps you stay informed through normal activities like cooking, cleaning, and relaxing with family, while still remaining mindful of environmental changes around you.

Interconnected safety you can rely on

When paired with compatible BRK or First Alert hardwired detectors, these units can interconnect so alarms sound in unison across multiple rooms. A distinctive latching alarm indicator automatically identifies which unit initiated the alert, even after conditions have subsided, helping you quickly pinpoint the source and respond with confidence.

• Interconnects with compatible hardwired BRK/First Alert detectors
• Latching indicator reveals the initiating unit
• Tamper-resistant locking brackets for secure installation
• Universal mounting brackets for flexible placement

Power, control, and clarity

The unit supports simple daily operation with a single test and silence button, allowing quick checks and temporary quieting of nuisance alerts. Status indicator lights clearly differentiate between smoke and CO conditions, aiding rapid interpretation during busy moments and ensuring you understand the situation at a glance.

• 9-volt backup battery maintains protection during outages
• Single test and silence button for easy checks
• Indicator lights differentiate smoke from CO alerts
• Compact, all-in-one design for straightforward installation

Practical coverage for everyday safety

A 4-pack provides a convenient way to equip multiple zones of a typical home, such as living areas, hallways, and bedrooms. The dual-sensor approach and interconnected capability offer a layered alert system without requiring separate devices for smoke and CO detection. While no system can guarantee results, this setup helps keep you informed as conditions evolve, supporting a proactive safety routine.