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First Alert Smart Onelink Smoke + CO Alarm - Battery Operated (1042138)
First Alert 1042138 One Link Wi-Fi Smoke And Carbon Monoxide Detector

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Onelink Smart Smoke + Carbon Monoxide Alarm - Battery Operated

Add intelligent protection to your home with the Onelink Smoke & Carbon Monoxide alarm. This 2-in-1 combo alarm detects both smoke and carbon monoxide. Regardless of whether you're home or away, you'll be notified when smoke or co is detected. This First Alert Onelink Combo Alarm is capable of identifying the type and location of the danger. You'll also be able to create a personalized smoke and co safety network by interconnecting other compatible alarms.

Mobile Connectivity Through the Onelink Home App

With the Onelink Home app you can test and silence your alarm and assign the locations of each device in your home.

Smart Home Safety Network

Wirelessly interconnect with other First Alert & Onelink devices (sold separately) to create a smart home safety network. When one alarm is triggered, all connected devices will sound off. This alarm is also compatible with Amazon Alexa, so you can ask Alexa to check the status of your Onelink alarm. The Onelink Home App is compatible with both Android and Apple devices.

Voice Alerts and More

Emergency notifications alert you to danger via your phone, while voice and location technology tell you the type and area of danger; the Onelink also uses a traditional 85-decibel siren.


The Onelink Smoke & Carbon Monoxide alarm is battery-operated and has an easy access battery door for convenience. This Onelink Alarm comes with a 3 cell battery pack, and based on regular alarm usage, the battery will last approximately five years.

Onelink Battery Operated Smart Smoke + Carbon Monoxide Alarm (3nd Generation) 1042138

Generation Three Onelink Smart Smoke + Carbon Monoxide Alarm - Battery Operated

  • 2-in-1 Protection: Photoelectric Smoke and Electrochemical CO sensors
  • No low battery chirps in the middle of the night
  • 85 decibel Alarm with Voice Alerts
  • Voice with Location - Voice announces programmed location of the unit and danger detected
  • Multicolor Indicator Ring Provides visual indication of various alarm states
  • Wi-Fi and Bluetooth Wireless Interconnect
  • Bluetooth Mesh Network Communication/2 way communication allows alarms to speak with one another
  • Utilization of Wi-Fi allows users to receive emergency notifications
  • Compatibility: Apple HomeKit and Google Play
  • Receive notifications via iPhone, iPad and iPad Touch (Requires iOS 9.0 or later)
  • Meets UL217 and UL2034 Standards for Smoke and CO Alarms
  • Product Dimensions (LxWxH): 5.88 x 5.88 x 1.57 in.
  • Product Weight: 0.75 lbs.
  • Warranty: 5 Year Limited
1042138 SKU: 1042136
First Alert Smart Onelink Smoke + CO Alarm - Battery Operated

Average Rating: Average Rating: 5 of 5 5 of 5 Total Reviews: 2 Write a review »

  0 of 0 people found the following review helpful:
5 of 5 Awesome customer service May 24, 2020
Reviewer: Desiree First from Iowa City, IA United States  
Some of the best customer service I have ever experienced along with great alarms.  We love that they talk and all alarm together. Very easy to install. If we ever need more we will order here.

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  0 of 0 people found the following review helpful:
5 of 5 November 20, 2019
Reviewer: PL from Buffalo, MN United States  
Works just like it is supposed to

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