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Home Safety / First Alert 3120B

Hardwired Smoke Detector with Easy Replacement Adapter Plugs

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$ 37.99   $26.59   save 30%
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All The Must-Know Details


Easy Installation with No Rewiring

Convenient adapter plugs make it simple to replace existing hardwired alarms without rewiring.

Keep Your Family Safe

Stay protected with a First Alert hardwired smoke alarm that offers 10-year battery backup, providing constant monitoring during power failures.

Reliable Ionization Sensor

Reliably detect fast-flaming fires with an ionization sensor that triggers an 85-decibel alarm to alert you quickly.

Connect and Protect

Easily connect to compatible BRK or First Alert smoke alarms to ensure all alarms sound when smoke is detected.

Simple and Secure

A single test/silence button and side-load battery compartment make this smoke alarm easy to use. Tamper-resistant locking brackets and universal mounting brackets ensure safe installation.

Meets UL Standards

Rigorously tested to meet UL standards, giving you peace of mind.

Trusted for Home Safety

Choose First Alert, the most trusted brand in home safety since 1958.

Faster Job Site Turnarounds

Enjoy faster job site turnarounds with the most-trusted alarms in home safety.


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