Prices, Promotions, styles, and availability may vary. Our local stores do not honor online pricing. Prices and availability of products and services are subject to change without notice. Errors will be corrected where discovered, and Lowe's reserves the right to revoke any stated offer and to correct any errors, inaccuracies or omissions including after an order has been submitted.

Hardwired (with Battery Backup) Smart Photoelectric Interconnected Combination Smoke and Carbon Monoxide Detector

Ratings & Reviews for First Alert Hardwired (with Battery Backup) 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 carbon monoxide detector for reliable performance and seamless Google Home integration. Most appreciate the easy installation using existing mounting hardware, step-by-step app setup, and interconnected alarms that trigger throughout the home. The photoelectric sensor reduces false alarms from cooking, while voice alerts clearly identify danger type and location. Many value app notifications and remote muting capabilities. However, some miss the nightlight feature from previous models, and a few report app complexity, lower alarm volume, or occasional WiFi connectivity issues. Overall, most customers consider it a dependable safety upgrade despite minor drawbacks.

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

Works good!

Would Recommend

Great quality and peace of mind. I installed this a few weeks ago and im impressed. Set up was super simple just mount and power on. The voice alerts are clear and the carbon monoxide and smoke detection are a huge win in my books, Love how it blend into the ceiling too!

Was this Review Helpful ?

Easy install, nice unit

Would Recommend

Very easy to install, it even used the same connector type as the alarms I was replacing. As soon as I powered it up it started speaking (in English, but with an option for Spanish) to guide me through the setup process. It also came with wirenuts and an adapter for what I assume is another standard smoke detector connector, which is a nice touch.

March 17, 2026
Lowe's Loop
Was this Review Helpful ?

Great upgrade from your old smoke alarms

Would Recommend

Great new unit. Easy to install, has an app and can link to google home services. Very clear instructions that guides you through the installation of the hardware and software. I will be updating the rest of the home now.

Was this Review Helpful ?

Smart smoke & CO2 detector

Would Recommend

The First Alert SC5 smart smoke and carbon monoxide alert are a great addition to any connected smart home. My previous smart detectors had reached their end of life and these were a good update. The app was easy to navigate and add multiple units and name them. Testing the alarm is simple through the app as well - weekly testing is advised and easy. Multiple wiring harnesses are included, they're nearly plug and play. I have only had these installed a couple of weeks but no problems so far.

March 17, 2026
Lowe's Loop
Was this Review Helpful ?

Great upgrade for fire/co2 alarms!

Would Recommend

We love the upgrade of these fire alarms! There's a lot of security knowing that you'll get the alerts on your phone if something happens when you're not home! But even if you don't attach them to your phone, they're superior alarms. Hardwired with a backup battery is the safest, best way to go. the design is super simple and easy to install. I wanted to create a circuit where I have reliable hardwired smoke/co2 detectors, and I'm thrilled with these. They really dont go off when there isn't an ...

March 17, 2026
Lowe's Loop
Was this Review Helpful ?

Do Not Buy- False Alarms

Would Not Recommend

First Alert has not figured out smart wifi smoke detectors. This one started giving false alarms 4 months after installation. I also had their prior version of the smart smoke detector, which also gave false alarms in the first month. When they discontinued that prior one and came out with this one over a year later, I was hopeful the fixed the issues. They were installed in two different locations in my house, which have had no issues with standard non-wifi First Alert smoke detectors, so I am ...

March 16, 2026
Was this Review Helpful ?

Smart detector

Would Recommend

This is a great smart detector. The alarm is loud. I like that it tells you how much carbon monoxide is detected and connects to the app. It’s sleek and looks modern to boot.

Was this Review Helpful ?

Replacement

Would Recommend

Easy to install replacing Nest detector

Was this Review Helpful ?

Highly recommend

Would Recommend

These FIRST ALERT SC5 Hardwire Smart Smoke & Carbon Monoxide Alarms are a really good investment for the safety of your family and home. They work with Nest Protect and you can install an app that you can get alerts on your phone when away from home, Voice alerts with Heads-Up warning tells you the type and location of danger in your homeThey also have battery backup which provides continuous protection during power outages. It come wit a 10 warranty limited. I definitely recommend this produc...

March 13, 2026
Lowe's Loop
Was this Review Helpful ?

High End Device

Would Recommend

These are great. You can wire them but in places where that's not possible, you can use the battery. Setup is easy with the app and you can monitor everything from your phone.

March 13, 2026
Lowe's Loop
Was this Review Helpful ?

Neat device with connection issues

Would Not Recommend

This thing is packed with lots of cool features, like giving a count down before alarm and sending updates to your phone. Unfortunately, the device has had connection issues to the WiFi or app, and I had to factory reset it twice in a month to get a good connection. I haven't had any false alarms like others were stating, but I get updates on the app whenever it drops connection, then it reconnected about 10 minutes later each time. I ended up taking it off the app and just use it as a standalon...

Was this Review Helpful ?

Nice replacement for the old ones!

Would Recommend

The old ones were taken off when I repainted and net put back because they looked so out of place. These nice looking ones fits the color way perfectly and function as intended. Straight forward installation. Looking great and I can rest assured that the family is protected.

Was this Review Helpful ?

Great fire and C/D sensor. Easy app set up!

Would Recommend

I wasn’t sure how easily this would be to install and wire in but I was pleasantly surprised! Once you have the app downloaded everything works perfectly! I would highly recommend this to anyone putting together their “smart home”

March 11, 2026
Lowe's Loop
Was this Review Helpful ?

High quality smoke/CO detector!

Would Recommend

This smoke/CO detector looks and feels sturdy, durable and well made with quality materials. I ordered the battery powered detector because it is easier for me to install and it comes with the batteries and all materials for installation. The instructions were easy to understand and follow and it took me about 10 minutes from start to finish to install and set up. The First Alert App was easy to navigate and walked me through the set up process. I like that I can pull up the app on my phone anyt...

Was this Review Helpful ?

Great Features and Simple Setup

Would Recommend

This smart smoke and CO detector offers excellent peace of mind. I really like the ability to receive notifications when I’m away from home, and the option to mute the alarm from the app is a huge improvement over waving a towel to clear the air. Setup through the app was quick and simple, and the detector itself has a sleek, modern look that blends nicely with the ceiling.

Was this Review Helpful ?

Plug in using the adapter if replacing Google/Nest

Would Recommend

Easy replacement for ten year old Google/Nest thermostats

March 10, 2026
Verified PurchaserIncentivized
Was this Review Helpful ?

Junk and customer service is horrible

Would Not Recommend

These things are terrible. They set off if they have not been cleaned once a month, giving false alarms. and continue to alarm even after silencing. Then, when you call to get help and complain about the product, you are told that the call will be cut off. These things are garbage!!!!

Was this Review Helpful ?

Great alarm, easy to install.

Would Recommend

This combination smoke and CO detector is easy to install (assuming the wiring is in place already.) The connnections matched what is installed in my house and came with a number of connectors to adapt to a number of connection situations. It is sleek an unassuming. Setting it up was a breeze though the location where I installed it above the curving stairs made holding the center button for 10s a bit difficult, but that is a me problem. My only detraction is the green light that stays lit const...

March 10, 2026
Lowe's Loop
Was this Review Helpful ?

Good replacement for Nest

Would Recommend

Easy Install. Good replacement for Nest smoke / co detector. Only thing it's missing is the nightlight feature that the Nest had and it is also a little more expensive than the Nest but overall good implementation and easy installation and set up via the app.

March 10, 2026
Verified PurchaserIncentivized
Was this Review Helpful ?

typical first alert junk.

Would Not Recommend

worst smoke detector I've seen in my 30 year career as a master electrician. don't fall for any of their lying responses. 6 false alarms in 7 months.

March 10, 2026
Was this Review Helpful ?