[shortdesc]

Alarm Type	Smoke
Power Source	Hardwired
Sensor	Photoelectric
Interconnects	Yes - Wireless
Battery	AA Batteries

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The First Alert SA521CN-3ST (SA520B) Wireless Interconnect Integrated Smoke Alarm links the alarms throughout your home. This 120V AC hardwired wireless detector with battery backup integrates single alarms into a system. By adding Wireless Interconnect battery-powered alarms elsewhere, when one alarm sounds, all alarms will be notified. Easily link alarms with the press of a button. The RF Interconnect technology continues to provide reliable and secure radio frequency communication between Wireless Interconnect alarms. This technology features 915 MHz frequency with 65,000 security codes, and three (3) channel frequency hopping.

The SA521CN-3ST features a perfect mount system for perfect alignment, a low battery latch and (2) silence features. You can silence the low-battery chirp for eight hours or temporarily silence a nuisance alarm. The Wireless Smoke Alarm is warranted to the original purchaser for a period of 10 years that meets with the UL standards.

The First Alert SA521CN-3ST Interconnected Smoke Alarm with Hardwire Adapter Included allows you to create an interconnected fire alarm system without the cost and hassle of wiring. Use this smoke detector to replace an existing hardwired smoke alarm and then install additional First Alert Wireless alarms for an interconnected safety network (additional alarms sold separately). This hardwired smoke detector can connect and communicate with up to 18 compatible alarms, so when one alarm is triggered, the entire system reacts. An integrated battery backup ensures the smoke alarm continues to work even during power outages.

Create an Interconnected Fire Safety System:
The Alert SA521CN-3ST Interconnected Smoke Alarm with Hardwire Adapter Included makes it easy to begin creating a safety network of detection. This model is designed to replace an existing hardwired 120-volt alarm so you can add up to 18 First Alert Wireless Interconnected alarms and get expanded protection. By connecting multiple Wireless Interconnected alarms, you can be alerted to danger on the other side of your house before the smoke from that area reaches you. When one alarm sounds, all connected alarms in the system will sound simultaneous. Earlier notification of danger means you can escape sooner.

Hardwired Alarm Installs Easily:
The smoke detector is designed for non-professional, do-it-yourself installation. It is designed to easily replace most existing 120-volt hardwired alarms. In the case of power outages, the smoke alarm has a battery backup feature designed to ensure continuous detection. A low-battery light and chirp will let you know when the AA batteries need to be replaced. A one-touch button silences false alarms and allows you to test the smoke alarm for functionality.

Comprehensive Warning Features:
The smoke alarm features an 85-decibel siren that is designed to wake even the soundest of sleepers. This smoke detector uses a photoelectric sensor that is designed to detect the presence of smoke while minimizing false alarms from cooking smoke and shower steam.

Easy access battery drawer: no need to remove an alarm from the ceiling to charge the battery.

The audible alarm emits low-frequency sounds
Interconnects with other alarms without wires
1-button silence and test
Alarm remember which device started the series
Onelink alarms by First Alert feature a wireless connection so when one alarm is triggered, all alarms sound
Photoelectric smoke sensing technology reduces nuisance alarms
Easily expand an existing interconnected 120-Volt AC system by replacing one alarm with the SA521CN-3ST
Comes with a 10-year limited warranty

Don't know what type of smoke alarm is right for your home? Check out our guide on how to choose the right smoke detector for your home.

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In The Box

1 x Wireless Hardwired Smoke Alarm (Bridge Unit)
1 x Mounting Bracket
1 x Power Connector
1 x Dust Cover
1 x English/ Spanish Instructions Manual

Info & Guides

User manual

Spec sheet

Wireless Guide

BRK First Alert - SA521CN-3ST Interconnected Hardwire Wireless Smoke Alarm with Battery Backup