First Alert SC5 Hardwire Smart Smoke & Carbon Monoxide Alarm, SMCO600NV-AC, 1-Pack
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FREE refund/replacement until Jan 31, 2026
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
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Availability:
In Stock.
Arrives
Sunday, Jan 11
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Style: Hardwired
Features
- Compatible with 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 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
Description
The fire safety you trust is now connected and compatible. Add smart fire safety alerts to your home with the First Alert SC5 Hardwire Smart Smoke and Carbon Monoxide (CO) Alarm. This 2-in-1 device elevates your home’s fire and CO safety whether home or away.
Brand: First Alert
Style: Hardwired
Power Source: Corded Electric
Color: White
Product Dimensions: 5.75"D x 1.6"W x 5.75"H
Alarm: Audible
Number of Items: 1
Manufacturer: First Alert
UPC:
Brand: First Alert
Style: Hardwired
Power Source: Corded Electric
Color: White
Product Dimensions: 5.75"D x 1.6"W x 5.75"H
Alarm: Audible
Number of Items: 1
Manufacturer: First Alert
UPC: 194160013717
Part Number: SMCO600NV-AC
Item Weight: 10.5 ounces
Item model number: SMCO600NV-AC
Batteries: 1 C batteries required. (included)
Item Package Quantity: 1
Included Components: 3V Lithium Battery Pack
Batteries Included?: Yes
Batteries Required?: Yes
Battery Cell Type: Lithium Ion
Date First Available: January 2, 2025
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sunday, Jan 11
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Similar Products
Top Amazon Reviews
Style: Battery
Let me start by saying, I was a huge fan of my old Nest Protect smoke and CO alarm. It served me loyally for a decade, always reliable and almost a little too smart for its own good. When it finally nudged me to upgrade, I figured this new First Alert SC5 "Smart Smoke & Carbon Monoxide Alarm"—especially since it's pitched as compatible—would keep that peace of mind going. But wow, was I wrong on that. The first thing I noticed is the style: side-by-side, this new First Alert device just looks plain clunky next to the smooth, modern Nest Protect that's been a familiar face in my home. In the attached photo, you can see what I mean—the new alarm is bulkier, with a glowing blue ring that honestly feels more sci-fi than homey. Setting it up threw me for a loop, too. It was far less intuitive, didn’t pair as easily, and generally left me wishing I had my old friend back. I had to read the instructions twice, and for someone who usually breezes through tech installs, that’s saying something! But here’s the kicker—this alarm costs way more, but seems to do a whole lot less. All the features I loved (smooth app integration, ease of testing, helpful heads-up notifications) feel stripped down or just awkward to use here. You’d think for the price, it’d offer an upgrade, but honestly, calling it a “sidegrade” would be generous. Even the "precision detection technology" is marketed as an improvement, yet I can't say it feels any better than my Nest ever did. I half-expected it to start making me coffee in the morning for this price. My advice? Don’t buy into the hype just because Google nudges you with compatibility talk. If you’re in the market, a $30 plain old detector probably does the same job (minus the pretty lights) without any of this frustration. Google used to say “don’t be evil,” but pushing people towards a more expensive, less functional product has me wondering if they remember their own slogan.
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Reviewed in the United States on September 19, 2025 by Sam Beckett Sam Beckett
Style: Hardwired
Our NEST smoke detectors had expired after 10 years and I was pissed off to discover that they no longer make new ones. These First Alert SC 5 are pretty much the next best thing- not perfect but good enough. The downside- no path light or motion sensor and they don’t show up on the legacy NEST app. The good side- they integrate seemlessly on the Google Home app and they do work in conjunction with my other NEST detectors to all sound in case of an alarm. The NEST detectors don’t show up on the First Alert app Installation was really easy- they provide a harness that hooks onto the old nest connector and the SC5 actually mounts on the NEST mounting bracket so you don’t need any tools to make the swap. It’s literally plug and play. The first Alert app for IPhone was really easy to use and setup of 3 units was very fast In time I don’t think I’ll miss the Nest features I’m giving up
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Reviewed in the United States on August 9, 2025 by DB
Style: Hardwired
These replaced nest protects that in 10 years never once false alarmed. This product created nearly a dozen false alarms in the first week. And you can’t shut the false alark off. Not by pushing the crap “button” that has no real tactile feedback, not with the app; only if you remove it from the ceiling, unplug it, and unplug the battery connector (with pliers!), can you shut them up. Great fun in the middle of the night on a ladder. I’m not even going to go into the bright status LED or the nonsensical alarm light button. Everything is just awful. Started return for all 9 of them and will be replacing with a different, not first alert product. I spent $1200 on these, a princely sum even if they did work perfectly. It’s an awful product that’s trying to ride on nest protect coat tails now Google has exited this business. Somebody should take this as a textbook case for what not to do in product development/management. They learned nothing and in fact managed to regress to what Nest set out to solve in the first place: make a better detector that doesn’t annoy you. The path to a great design is clearly represented by a decade old product and this is more expensive (a multiple of competitive solutions) and executed far far worse in every aspect. What a massive disappointment. Believe the reviewers who say this is junk. I didn’t want to but here we are. Hardwired or battery makes no difference.
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Reviewed in the United States on September 20, 2025 by C. Kuhtz
Style: Battery
First off, this was purchased to replace a soon to expire Nest Protect. The Nest is far superior and still very disappointed that it’s not being updated. Anyway… I went through the install process and had to do it about 10 times! It would not register. Finally, the process completed and the transfer to Google went through. I noticed that once it was working, the Google app shows that my brand new batteries the came in the unit needed to be replaced! How? This unit was manufactured this month! Now I need to buy new batteries for it. That’s probably why it wouldn’t work initially. The final complaint is the speaker is not very good and the warnings/information sound muffled. Not off to a good start. Unfortunately, the convenience of using one app is offset by the limitations of this unit. Update: I reached out to First Alert for some support and since the unit said even my newly purchased batteries showed they needed replacing and the unit didn’t want to connect to WiFi or register in Bluetooth, it probably was defective. They’re sending me a new one so we’ll see how it goes. Update 2: Ok. I was able to determine that (in fairness to First Alert) that the aforementioned issues could be traced back to my Alien router. The smoke detector, like a lot of devices, can only use a 2.4 GHz network signal. I found that my router was no longer transmitting that frequency. To remedy the issue, I connected a second router to alien and used the 2.4 signal from that one and…Voila! The First Alert install worked perfectly. While it’s still not my wonderful Protect, it serves its purpose.
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Reviewed in the United States on August 22, 2025 by Glenn