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Battery-operated Smart Photoelectric Interconnected Combination Smoke and Carbon Monoxide Detector

Ratings & Reviews for First Alert Battery-operated Smart Photoelectric Interconnected Combination Smoke and Carbon Monoxide Detector

4.2
139
Review
 4.2 out of 5
139 Reviews


77% Recommend this product

Ratings may include incentivized customer reviews.

What Customers Are Saying

Customers overwhelmingly praise this smart smoke and CO detector as a reliable replacement for discontinued models, with strong satisfaction around smart home integration, ease of installation, and enhanced safety features. Most highlight seamless app connectivity, real-time mobile alerts, and the ability to manage multiple units through a single interface. The interconnected alarm feature—where all detectors activate when one sounds—is widely valued for household safety. Many commend the photoelectric sensor for reducing false alarms from cooking and appreciate voice alerts that identify emergency type. The sleek design, hardwired installation with battery backup, and fit on existing mounting plates are frequently praised. A few report occasional false alarms or note the absence of a night-light feature, though most consider these minor drawbacks.

Customer review summary generated by AI, including incentivized reviews.
139 Customer Reviews

unreliable

Would Not Recommend

I purchased the smoke and carbon monoxide detector to replace our current Nest detectors which were at their 10 year life span. They have given false carbon monoxide and smoke detection multiple times in two months.

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Response from FirstAlertProductExpert

Hi, thank you for reaching out! We take your issue seriously. Under normal conditions and with proper installation, the detectors should function rel...

FirstAlertProductExpertSeptember 11, 2025

FirstAlert

Great update from Google Nest Protect

Would Recommend

Our smart home ecosystem is predominantly Google, between Google Home speakers, Nest cameras, etc. We were using the Nest Protect for smoke detectors (both battery and hardwired). They were ok, good integration with Google Home, but lacked wired interconnectivity support and were kind of finicky. Our home is older and we had our breaker box replaced, the city inspector told us the only update we need to make for code compliance is to have interconnected smoke alarms installed (we didn't have an...

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No pathlight. Have to install FA app first.

Another “Google is killing me moment”. After going through the “forcing my to pay full price to replace a functional Gen 2 Nest Thermostat, I now have to find a replacement for the Nest Protect they are killing. Along comes this stat, the recommended replacement except wait, it does not have pathlight. So shell game to put this new stat in place of one of 4 Nest protects I have that is in furnace room that does not need pathlight, which is NOT the one that is expiring and move the nest in th...

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Response from FirstAlertProductExpert

Hi Mark C, thank you for taking the time to share your feedback regarding the SC5 detector. We are sorry to hear you feel this way. The SC5 is design...

FirstAlertProductExpertSeptember 12, 2025

FirstAlert

Replaces Nest. Not impressed.

Would Not Recommend

Replaced Nest products and the setup was easy. 3 units installed for one week and already had two false smoke alarms in the basement unit. Never happened with Nest in the exact same spot (brackets compatible). Further, you are unable to MUTE the alarm until it deems the “smoke” has cleared. So, all three units are blaring for a minute or two without any option to override the alarm. No heads up alert (although enabled).. nothing. Just 3 alarms going off and nothing you can do about it but cover ...

August 20, 2025
Verified Purchaser
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Response from FirstAlertProductExpert

Hi, thank you for sharing your experience. We understand how disruptive unexpected alarms can be and would love the chance to help resolve this with ...

FirstAlertProductExpertAugust 26, 2025

FirstAlert

First Alert is not Nest

Would Not Recommend

I thought I was getting a direct replacement for my expiring Nest products - WRONG! They just connect to the Nest app. The First Alert app is not as good either, instructions are inadequate.

August 16, 2025
Verified Purchaser
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Response from FirstAlertProductExpert

Hi Ricco, thank you for your feedback, we understand how important continuity and design are when transitioning from long-term Nest devices. While ou...

FirstAlertProductExpertAugust 26, 2025

FirstAlert

poor alarm

Would Not Recommend

poor alarm i tried to pair to my nest system and was a headache and the sound is like a horn car

August 13, 2025
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Response from FirstAlertProductExpert

Hi laradiesel, thank you for sharing your experience. We're sorry to hear you're struggling with your SC5 detector. Please contact First Aler...

FirstAlertProductExpertAugust 14, 2025

FirstAlert

Be cautious, it will NOT connect with Nest

Would Recommend

I liked that it fit perfectly on the mount where the Nest Protect used to be, however I didn’t like that it would not connect seamlessly with my Nest thermostat.

August 6, 2025
Verified Purchaser
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Lot's of room for improvement

Would Not Recommend

I was looking for a replacement for my existing smoke detectors and decided to give this one a go. My primary needs were: 1. I wanted to be able to pause an alert from my phone. Our ceiling is about 13' where the smoke detector is, so it's not possible to touch it without a ladder. 2. I wanted to know if any smoke detector triggers when I'm not home I've had this smoke detector for about a week and have not been impressed by it. 1. A couple of days after installing the smoke detector, my wifi...

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Response from FirstAlertProductExpert

Hi David, thank you for your detailed feedback, we truly appreciate you taking the time to share your experience. We're sorry to hear the setup p...

FirstAlertProductExpertAugust 12, 2025

FirstAlert

good replacement for discontinued Google Nest det.

This is a nice smoke/CO detector and was easy to install, replacing the discontinued Google Nest detector using the Nest base (i.e., you don't have to disconnect/remove the Nest base and rewire/install the First Alert base). You can also add the SC5 to online monitoring apps, although not to the Google Nest app which may be on its way out like the Nest detector. In place of the Nest app, you download the First Alert Resideo app, add the SC5, and then if you'd like, you can download the Google Ho...

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Okay Replacement Option for Nest But a Downgrade

Would Recommend

Recently purchased several of these First Alert Battery-Operated Smoke and CO2 Detectors to replace my expiring Nest Protect Smoke/C02 Detectors, which had worked with no issues for 10 years using the Nest App and more recently the Google Home App. These First Alert detectors are currently the best option if you want a smart smoke/C02 detector similar to the discontinued Nest detectors, but in my opinion the First Alert detectors fall short and are a downgrade especially given the price poin...

July 17, 2025
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Pros / Cons

Would Not Recommend

Replaced my Nest. Easy to install, didn't need to install a new mounting bracket--Yaay! but it's NOT the Nest. The original Nest was a much better design. First Alert forgot about the night light feature that lit up every time you walked down the darkened hallway at night. Also doesn't work with the current Nest app so you need to install First Alert's which is really stupid. First Alert's app isn't anything to write home about...the original Nest team did a way better job with the user int...

July 17, 2025
Verified Purchaser
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Response from FirstAlertProductExpert

Hi ScotC, thank you for your feedback. We understand how important continuity and design are when transitioning from long-term Nest devices. That bei...

FirstAlertProductExpertAugust 8, 2025

FirstAlert

Good unit

Would Recommend

I like that it integrates with my nest protects. Only thing I don’t like is the voice and alarm sounds is too low compared to my nest protects

July 17, 2025
Verified Purchaser
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Replaced Nest

Would Recommend

PERFECT replacement for my 5 old Nest smoke detectors that expired this month. The back plate that was originally mounted onto my walls from Next …can be left in place, as the new First Alert Smart Alarm made their new alarm fit seamlessly onto it! Simple setup too!

July 8, 2025
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Pleased with features

Would Recommend

I very recently purchased and installed this device. I was looking for a smart Smole/CO, as I wanted to be notified if my devices ever activated and I wasn't home. The installation was straightforward, and the device interconnects to my existing Smoke/CO's detectors. Once the app is installed, connection to WIFI is easy. I like the ability to test the device directly from the app.

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