120-Volt AC Hardwired Wireless Smoke Detector with Photo-Electric Sensor

Item # 203658773 | National Brand Alternative Part # SA520B | UPC Code 029054002051 | UNSPSC Code 46191501
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Product Overview

The Wireless Smoke Alarm detects smoldering fires and has a spread spectrum horn tone. This alarm will sound if it detects smoke even during power outages. It uses a secure radio frequency with 65,000 security codes to communicate between alarms, which are perfect for linking alarms on different floors or in stairwells. No wires necessary and it's programmable with multiple alarms for a home safety system. Other features include a test and silence button, a latching indicator that remembers which unit initiated the alarm and smart technology that helps reduce false alarms. The SA520B can be connected to other smoke alarms and offers 360 degree . access to the smoke sensor. If 1 unit triggers an alarm, all smoke alarms in the series will sound. The SA520B features a perfect mount system for perfect alignment, a low battery latch and 2 silence features. You can silence the low-battery chirp for 8-hours or temporarily silence a nuisance alarm. The Wireless Smoke Alarm is warranted to the original purchaser for a period of 10-years. First Alert invests time and research into providing dependable and hardworking products. Committed to innovation and value, First Alert improves safety in and around the house.

  • 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 1 alarm is triggered, all alarms sound
  • Photoelectric smoke sensing technology reduces nuisance alarms
  • Easily expand an existing interconnected 120-Volt AC system by replacing 1 alarm with the SA520B
  • Comes with a 10-year limited warranty


Alarm Sensor Type
Alert Type
Certifications and Listings
ETL Listed, TUV Listed
Battery Back-Up
Pack Size
Power Source
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Product Width (in.)