• Model #: SA520
  • SKU #: SA521CN-3ST
  • Additional SKUs

Interconnected Smoke Alarm with Hardwire Adapter Included

  • Hardwired smoke alarm can communicate wirelessly with other compatible alarms to create a fire alarm system (additional alarms sold separately)
  • When one alarm is triggered, all connected alarms will sound
  • Integrated battery backup allows continuous detection during power outages
  • Model #: SA520
  • SKU #: SA521CN-3ST
  • Additional SKUs

Interconnected Smoke Alarm with Hardwire Adapter Included

  • Hardwired smoke alarm can communicate wirelessly with other compatible alarms to create a fire alarm system (additional alarms sold separately)
  • When one alarm is triggered, all connected alarms will sound
  • Integrated battery backup allows continuous detection during power outages

Interconnected Smoke Alarm with Hardwire Adapter Included

  • Model #: SA520
  • SKU #: SA521CN-3ST
  • Additional SKUs

Features

The First Alert SA521CN-3ST Interconnected Smoke Alarm with Hardwire Adapter Included allows you to create an interconnected fire alarm system without the 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 and fire detector can connect and communicate with up to 18 compatible alarms, so when one alarm is triggered, the entire system will sound. Equip with battery backup, this smoke and fire alarm allows for protection during power outages.

  • Create an Interconnected Fire Safety System
  • Hardwired Alarm Installs Easily with Adapter Plugs

The First Alert SA521CN-3ST Interconnected Smoke Alarm with Hardwire Adapter Included allows you to create an interconnected fire alarm system without the 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 and fire detector can connect and communicate with up to 18 compatible alarms, so when one alarm is triggered, the entire system will sound. Equip with battery backup, this smoke and fire alarm allows for protection during power outages.

  • Create an Interconnected Fire Safety System

The First Alert Interconnected Smoke Alarm with Hardwire Adapter Included makes it easy to begin creating a safety network of detection. This detector is designed to replace an existing hardwired 120-volt alarm so you can add up to 18 First Alert wireless interconnected alarms  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 simultaneously.

  • Hardwired Alarm Installs Easily with Adapter Plugs

The smoke detector is designed to easily replace most existing 120-volt hardwired alarms. Equip with an easy adapter plug, there is no need to rewire when installing the alarm. Also, in case of power outages, the smoke alarm has a battery backup feature designed to ensure continuous protection. A low-battery light and chirp will let you know when the AA batteries need to be replaced in the detector.

Specifications & Manuals

Specifications

SKU(s)

1039830, SA521CN-3ST

Model

SA520

UPC

29054002440

Warranty

10-Year Limited

Battery Backup

Two AA

Sensor Type

Photoelectric

Item Length

5 in.

Item Width

2 in.

Item Height

5 in.

Item Weight

1 lb