First Alert SC5 Hardwire Smart 2-in-1 Smoke and CO Alarm with Voice Alerts and Battery Backup
First Alert SC5 Hardwire Smart 2-in-1 Smoke and CO Alarm with Voice Alerts and Battery Backup
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First Alert SC5 Hardwire Smart 2-in-1 Smoke and CO Alarm with Voice Alerts and Battery Backup

|20 ratings

Key item features

  • 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 1 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 in your home
  • Equipped with Precision Detection Technology to help reduce nuisance alarms and provide an early warning
  • Quick-connect plug allows for easy installation and replacements with no need to rewire
  • Photoelectric
  • Includes mounting plate, batteries for backup, quick-start guide, and manual

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Customer ratings & reviews

4.6 out of 5 stars
stars
20 ratings10 reviews
How item rating is calculated
  1. 5 stars65% (13)
  2. 4 stars30% (6)
  3. 3 stars5% (1)
  4. 2 stars0% (0)
  5. 1 star0% (0)
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Showing 1-3 of 10 reviews

Jul 24, 2026
Reviewer name: anonymous
Top Reviewer
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

The Future is Now

This smart detector is just what I wanted. The packaging was phenomenal, and the product came very quickly. I opened the box up, and there were physical instructions to follow. Unfortunately, for my existing thermostat, I had a third wire (Orange), but fortunately, this thermostat is compatible with this. I was able to successfully set up within 30 minutes, and it connects to my home ecosystem like a charm. Whenever there is an alert, I get it instantly from my phone, and if smoke levels do rise, it alerts via the detector and the app as well. In a world of tech all around, this is a must for safety in your home.

Incentivized Review
Helpful?6LTZRMUMEUO219043618936
May 22, 2026
Reviewer name: HanSolo
Walmart Associate
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Great way to connect first alert product to nest.

I have a house full of interconnected first alert smoke detectors and two nest protect. I bought this to connect the first alert to the nest. Basically the SC5 is interconnected to the first alert smoke detectors and SC5 connects to nest through google home. Step up was easy. Decent future replacement to nest protect. Wish it has the night light though.

Incentivized Review
Helpful?6LTZRMUMEUO219043618936
Jul 22, 2026
Reviewer name: Nicole
Walmart Associate
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

This item works great. It was easy to install- both on the ceiling and with the app!

Incentivized Review
Helpful?6LTZRMUMEUO219043618936
Current price is $128.89
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