First Alert 9120B Smoke Detector 3-Pack – Hardwired Alarm with Battery Backup

Premium safety you can trust

Meet the BRK 9120B 3-pack—hardwired smoke alarms redesigned to install faster, require less maintenance, and work smarter from day one. Each unit runs on 120-Volt AC with a 9-Volt battery backup, so monitoring continues through power hiccups. The updated design emphasizes reliability and ease, helping you stay alert without being overwhelmed by false alarms.

Key benefits at a glance

• Hardwired with battery backup delivers continuous safety monitoring, even during outages.
• Ionization sensing targets fast flaming fires and triggers an audible alert at a confident level.
• Interconnect capability links up to 12 alarms and six compatible devices, so all units sound together.
• One button handles testing, silencing, and functional checks; tamper resistant mounting brackets ease install.
• Dust cover helps keep the unit clean during renovations; UL-tested and backed by a 10 year limited warranty.

Home coverage you can customize

For effective protection, consider placing one unit on every level and in bedrooms or high traffic areas. The interconnect feature helps create a unified alert system that travels through the space as needed.

What you get in a 3-pack

• Three BRK 9120B smoke alarms ready to install
• Universal mounting brackets and tamper resistant hardware
• Dust covers to keep units clean during construction
• Simple, straightforward maintenance that supports long term reliability

Designed with real homes in mind, this trio aims to reduce nuisance alarms while keeping the focus on timely alerts when it matters most. While individual results vary, many users appreciate the straightforward setup and the sense of added security that a networked alarm system can provide.

Fast, straightforward installation

The system is built for quick mounting and reliable alignment. The gasketless base and new mounting bracket help keep the unit secure across a wide rotation range, so you can position each detector with confidence. A dust cover is included to shield units during construction, ensuring they’re ready when you need them.