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Alert System Type
Smoke / Fire / Carbon Monoxide
Sensor Type
Smoke / Heat
Audible Indicator
Battery Backup
Ease of Installation
Intermediate (Installs < 60 minutes)
First Alert
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Build a Safety network of Interconnected Alarms in Your Home Without the Cost and Hassle of Wiring
First Alert SA501CN2-3ST Onelink Wireless Battery Powered Smoke Alarm - 2 Pack
First Alert SA501CN2-3ST Onelink Wireless Battery Powered Smoke Alarm - 2 Pack
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First Alert SA501CN2-3ST Onelink Wireless Battery Powered Smoke Alarm - 2 Pack
Item# 79860
Price: Normally $127.99 
Hot Deal $74.70
Free shipping on orders over $175 - See Details


  • Wireless integration gives effortless connectivity
  • Photoelectric smoke sensing with mute button
  • Test/silence button and Low Battery Warning
  • Easy access battery door, no need to remove from wall or ceiling
  • Optional theft-prevention lock protects the detector

Essential Info

The First Alert SA501CN2-3ST Onelink Wireless Battery Powered Smoke Alarm was designed for wireless smoke detector integration. Expand protection to include existing detectors and new wireless detectors by replacing one existing hardwired alarm with Onelink. By adding Onelink battery operated alarms elsewhere, when one alarm sounds in either series of alarms, all alarms will be notified. Easily link alarms together with the press of a button. Photoelectric smoke sensor reduces nuisance alarms from cooking smoke or shower steam. Easy access battery drawer, no need to remove alarm from ceiling to change battery. Meets UL standards.

Works with the INSTEON Smoke Bridge
The First Alert ONELINK Smoke detectors can be linked to the INSTEON Smoke Bridge to create email and text message alerts in case of smoke, fire or carbon monoxide using an INSTEON Hub or other central controller. It can also be linked to lights or other INSTEON devices manually or via software to turn lights on instantly in the event of an alert to make the escape faster, easier and safer.


What's Included

  • Wireless Smoke Alarm
  • 2AA Batteries
  • Specifications

  • Sensor: Photoelectric
  • Warranty Claim: 10-Year Limited
  • Color: white
  • Battery backup: AA
  • Product Dimensions (L x W x H): 7.20 (inches) x 2.90 (inches) x 10.40 (inches)
  • Images/Video

    Enlarged Front View  Enlarged Rear View  Battery Compartment   
    Enlarged Front View  Enlarged Rear View  Battery Compartment   


    8 Ratings
    5 star: 62%  (5)
    4 star: 25%  (2)
    3 star: 0%  (0)
    2 star: 12%  (1)
    1 star: 0%  (0)
    Average Customer Rating
    (8 customer ratings)
    Share your thoughts with other customers
    Craig -- lancaster, PA   5/30/2014
    They don't last long. We had 6 for 7 years and 2 have gone bad. They chirped for no reason.
    KEITH -- monson, MA   5/26/2014
    no suprises
    MICHAEL -- north haven, CT   2/22/2014
    Doing the job as advertised.
    STEPHEN -- port washington, WI   1/30/2014
    Set up was easy, you almost don't need the instructions.
    DANIEL DI -- north miami beach, FL   6/3/2013
    Works great. No problems at all.
    MARC -- los gatos, CA   3/20/2013
    Very easy to install, and link together. I like that they use AA instead of 9V batteries as well. I also got the CO2/Smoke detector as well.

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