First Alert SC5 Hardwire Smart Smoke and Carbon Monoxide Alarm
- Compatible with and replaces Google's Nest® Protect Alarm
- Sends alerts to your phone if smoke and CO are detected through the First Alert app
- Interconnect so when one alarm sounds, all compatible alarms in the home sound
- Battery backup provides continuous protection during power outages
- Voice alerts with Heads-Up warning tells you the type and location of danger
- Quick Connect Plug allows for easy installation and replacements with no need to rewire
- First Alert 8th Generation Smoke Detector meets the latest industry standards.
Upgrade to Smart Smoke & CO Detection
Effortlessly integrate the SC5 Hardwire Smart Smoke and CO alarm into your home’s safety ecosystem if you need to add detection or if it is time to replace. The quick connect hardwire adapter plug makes installation easy with no need to rewire. Interconnect when installing to help provide an early warning; when one alarm sounds, all compatible alarms sound throughout the home.
Get Advanced Safety Features
This smart 2-in-1 hardwired alarm is equipped with advanced features and the latest smoke alarm technology. In the event of a fire or CO emergency, the combination alarm will sound voice alerts with a warning that tells you the type and location of danger in the home to help you escape safely. Plus, receive mobile alerts through the First Alert app to stay informed whether home or away.
- 2 -in-1 smoke/fire and carbon monoxide alarm for detection against both threats.
- Sends mobile alerts whether home or away in the event of a fire or CO emergency.
- Voice alerts with Heads-Up warning tell you the type and location of danger in your home.
- Interconnect so when one alarm sounds all compatible alarms sound as one.
- Installation is quick and easy, with hardwire and battery alarm options available.
- Equipped with Precision Detection Technology to help reduce nuisance alarms.
Reduce Alarm Chirps
The SC5 Hardwired Smart Smoke and CO detector is easy to install and maintain to help ensure your home and family is protected. Test the alarm to ensure it is working properly using the app or the alarm's single test/silence button. This hardwired alarm features a battery backup and will provide in-app and audible notices when the alarm itself needs to be replaced.
Recommended replacement for the following model: Google's Nest Protect Smoke & CO Alarm.




Smart Smoke & Carbon Monoxide Detection
The First Alert App connects what matters most and puts you in control. Connect your smart smoke & CO alarm with the app to check the alarm's status, test alarm's function and receive mobile alerts if smoke and CO are detected.
Downloading the First Alert app is a crucial step to unlock the full potential of your First Alert Smart Smoke and Carbon Monoxide Alarm, transforming basic detection into a comprehensive home safety system. The app serves as your personal command center, delivering critical alerts directly to your smartphone no matter where you are. This means if a smoke or CO event occurs while you're at work, on vacation, or even just in another part of your house, you'll receive an instant notification, allowing for quicker response times and potentially mitigating damage or danger. This remote monitoring capability provides an unparalleled sense of security and peace of mind.
Beyond immediate emergency notifications, the First Alert app significantly enhances the usability and maintenance of your smart alarms. You can easily check the status of your detectors, including battery levels, directly from your phone, eliminating the guesswork and preventing those annoying late-night low-battery chirps. The app also allows for convenient remote testing of your alarms, ensuring they're always functioning optimally without needing to physically reach each unit. This proactive approach to maintenance ensures your home is consistently protected, giving you confidence in your safety system.

To meet certification standards, 2nd gen Nest Protect must be replaced after 10 years from the date of manufacture. When you’ve determined that your device needs to be replaced, you’ll need to select a replacement device, uninstall your Nest Protect, and set up your replacement device.
The First Alert Smart Smoke & Carbon Monoxide Alarm is a compatible replacement for your 2nd gen Nest Protect. Note: First Alert Smart Smoke and Carbon Monoxide Alarm will work with your other Nest Protect devices only in the Google Home app.
First Alert Smoke Alarm Models:
SMI100-AC
SM100V-AC
SM110V-AC
SM110LED-AC
SMI105-AC
7010B
9120B
First Alert/BRK CO Alarm Models:
CO5120BN
First Alert/BRK Heat Alarm Models:
HD6135FB
First Alert Smoke & CO Alarm Models:
SMCO600NV-AC
SMCO600NV
SMICO100-AC
SMCO100V-AC
SMICO105-AC
SMCO110V-AC
SMCO110LED-AC
SC7010BV
SC9120B
Google Nest Protect Alarm Models:
Nest Protect Smoke + CO Alarm - Battery and Wired
*Compatibility with Google Nest Protect requires the Google Home app and a Google Account.
- UL Certifications: UL 217 8th Edition & UL 2034 4th Edition
- Sensor Type: Electrochemical, Photoelectric
- Power Source: Hardwired
- Battery Replaceable: No
- Battery Backup: Yes
- Battery Type: 3V Lithium
- Hardwired Interconnectivity: Yes
- Sound Level: 85dB at 10 ft.
- Replaces Model: Google's Nest Protect Smoke & CO Alarm
- Warranty: 10 Year Limited
- Product Dimensions (LxWxH): 5.75 x 1.6 x 5.75 in.
- Product Weight: 0.93 lbs.
- Sku: SMCO600NV-AC
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