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expireddanieljchu posted Dec 5, 2025 2:25 PM

Costco Members: 2-pack First Alert SC5 Smart Smoke & CO Alarm (Wired or Battery)

$160

$260

38% off
+ Free Shippingat Costco Wholesale
41 Comments
16.8K Views
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Deal Details
Costco Wholesale has for Members: 2-pack First Alert SC5 Smart Smoke & Carbon Monoxide Alarm (Hardwired or Battery) on sale for $159.99. Shipping is free.

Thanks to Community Member danieljchu for sharing this deal.

Product Details:
  • Compatible With Google's Nest Protect Alarm
  • Equipped with Precision Detection Technology to help reduce nuisance alarms and provide an early warning
  • Smart Smoke & Carbon Monoxide Alarm
  • Voice alerts with Heads-Up warning tells you the type and location of danger in your home
  • Battery backup provides continuous protection during power outages
  • Photoelectric, Electrochemical
  • Smoke particles of varying number and size are produced in all fires. For maximum protection, use both ionization and photoelectric sensing technologies. Ionization alarms are generally more sensitive to fast flaming fires and photoelectric alarms are generally more sensitive to smoldering fires
  • Battery Powered includes: Six 3V CR123A Lithium Batteries per unit
  • Hardwired includes 3V Lithium Backup Battery Pack per unit

Editor's Notes

Written by citan359 | Staff
  • About this Deal:
    • Our research indicates that this deal is $60.01 less (27% savings) than the next best available price from a reputable merchant with prices starting at $220.00 at the time of this posting.
  • About this Product:
    • 10 Years Limited
    • Rated 4.1 out of 5 stars at Costco based on over 15 customer reviews.
  • About this Store:
    • If you don't have a Costco Warehouse Membership, you can sign-up here
    • You can view Costco's return policy here.
  • Additional Notes:
    • Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.

Original Post

Written by danieljchu
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Costco Wholesale has for Members: 2-pack First Alert SC5 Smart Smoke & Carbon Monoxide Alarm (Hardwired or Battery) on sale for $159.99. Shipping is free.

Thanks to Community Member danieljchu for sharing this deal.

Product Details:
  • Compatible With Google's Nest Protect Alarm
  • Equipped with Precision Detection Technology to help reduce nuisance alarms and provide an early warning
  • Smart Smoke & Carbon Monoxide Alarm
  • Voice alerts with Heads-Up warning tells you the type and location of danger in your home
  • Battery backup provides continuous protection during power outages
  • Photoelectric, Electrochemical
  • Smoke particles of varying number and size are produced in all fires. For maximum protection, use both ionization and photoelectric sensing technologies. Ionization alarms are generally more sensitive to fast flaming fires and photoelectric alarms are generally more sensitive to smoldering fires
  • Battery Powered includes: Six 3V CR123A Lithium Batteries per unit
  • Hardwired includes 3V Lithium Backup Battery Pack per unit

Editor's Notes

Written by citan359 | Staff
  • About this Deal:
    • Our research indicates that this deal is $60.01 less (27% savings) than the next best available price from a reputable merchant with prices starting at $220.00 at the time of this posting.
  • About this Product:
    • 10 Years Limited
    • Rated 4.1 out of 5 stars at Costco based on over 15 customer reviews.
  • About this Store:
    • If you don't have a Costco Warehouse Membership, you can sign-up here
    • You can view Costco's return policy here.
  • Additional Notes:
    • Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.

Original Post

Written by danieljchu

Community Voting

Deal Score
+39
Good Deal
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Top Comments

fritzo
4.4KComments
640Reputation
Yeah, I think I'm going to wait until a V2 of this product.

I'm still salty with Google for dropping the Nest Protect. They're famous for dropping hardware- makes me not want to invest in their ecosystem anymore.
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tismon
609Comments
201Reputation
Yeah, the false alarms reported on reddit aren't giving me confidence.
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ALS
2KComments
248Reputation
I don't understand why it's so hard for these manufacturers to make a good hardwired unit that does pathway. Don't a ton of homes have hardwired detectors these days? Battery just as backup. Pathlight wouldn't be a drain on a hardwired unit.
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41 Comments

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Dec 5, 2025 4:25 PM
132 Comments
Joined Oct 2008
marquinhocbDec 5, 2025 4:25 PM
132 Comments
Quote from sbaro362 :
I have two of these, one battery, one wired; no issues with false alarms but I will say they are not quite the same polished product the Nest ones were. They do work well and integrate nicely into Google Home and send notifications, emails, and such when they go off.
FWIW for anyone else worried about false alarms: I think it has to do with condensation, so be cautious

I bought 2 of them, only 1 gave the 1am ringing problem - I believe the cold (this was in the 2nd story in Colorado, i.e. some exposure to the cold above) results in condensation on the sensors

It explains why I only had the problem with one - if you're not in cold weather, you probably won't have a problem
Pro
Dec 5, 2025 4:35 PM
1.6K Comments
Joined Nov 2007
Halewafa
Pro
Dec 5, 2025 4:35 PM
1.6K Comments
I have had two of these installed for about 4 months now with no false alarms. I have 5 more alarms needing replacement, this is a great deal compared to the $130 I paid for each of them
Dec 5, 2025 4:43 PM
19 Comments
Joined May 2017
5290372641Dec 5, 2025 4:43 PM
19 Comments
Neither Nest Protects nor those First Alerts have a compatible heat detector that can be installed in the garage. This is a dealbreaker for me. Earlier mentioned Place devices have heat detector available but they are crazy expensive. My 10 Nest Protects expire in two years and I am currently eyeing X-Sense detectors for replacement.
Dec 5, 2025 4:53 PM
609 Comments
Joined Sep 2009
tismonDec 5, 2025 4:53 PM
609 Comments
Quote from 5290372641 :
Neither Nest Protects nor those First Alerts have a compatible heat detector that can be installed in the garage. This is a dealbreaker for me. Earlier mentioned Place devices have heat detector available but they are crazy expensive. My 10 Nest Protects expire in two years and I am currently eyeing X-Sense detectors for replacement.
Agreed, but that's a different product category. I've just got a Kiddie heat detector and now that SimpliSafe has added an alarm listener, it can be added to the monitoring.
Dec 5, 2025 4:56 PM
11 Comments
Joined Jun 2011
FrugalMonkeyDec 5, 2025 4:56 PM
11 Comments
First Alert should have taken on the Nest Protect design and improved upon it instead of using their own design and modifying it to incorporate into the Nest Protect.
2
Dec 5, 2025 5:00 PM
230 Comments
Joined Jul 2004
LDA1Dec 5, 2025 5:00 PM
230 Comments
I'm so bummed that the protects are going to die off. We have 9 in our home and they have performed flawlessly. We had one false alert since we installed them. I love the path light snd the beautiful design. Such a bummer.
Dec 5, 2025 5:01 PM
19 Comments
Joined May 2017
5290372641Dec 5, 2025 5:01 PM
19 Comments
Quote from tismon :
Agreed, but that's a different product category. I've just got a Kiddie heat detector and now that SimpliSafe has added an alarm listener, it can be added to the monitoring.
I would not agree with the different product category statement. In my state (ND) building code requires smoke/CO detectors in the house and heat detector in the garage and all of them need to be interconnected.

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Dec 5, 2025 5:26 PM
6.3K Comments
Joined Mar 2008
redpoint5Dec 5, 2025 5:26 PM
6.3K Comments
The path light was the only reason I bought the Nest version, so my daughters can see the hallway at night when they go to the bathroom.

I have no other use for overly priced detectors that are designed to shut off in 10 years.

Detectors should generally be separate units. I'd get the photoelectric units since they last forever, and there's no getting around CO detectors expiring, so just get a cheap one that plugs into an outlet (they don't have to be ceiling mounted).

I have 1 more hallway that could use pathway lighting, so I might go the Ebay route. Didn't realize they killed a cash cow and left that market demand wide open.
Dec 5, 2025 6:05 PM
1.9K Comments
Joined May 2012
Chemosh013Dec 5, 2025 6:05 PM
1.9K Comments
I've got 3 2028s and 5 2029s on my setup. So I guess I'll just keep an eye on the space and hope that a suitable replacement comes around.
Dec 5, 2025 6:19 PM
66 Comments
Joined Apr 2009
wpride33Dec 5, 2025 6:19 PM
66 Comments
Quote from greyster :
the reviews about this and the false alarms in general seems pretty bad. I had to get a nest replacement, i decided to go on ebay and buy another nest protect new which 8 years left on the expiry. I paid a bit over for it but i didnt want to have to drill a new plate into the ceiling. Some caution, do confirm the expiry of the alarm is in the description of the item or confirm with the seller.They stopped making them earlier this year but the ones they made up until that point have 10 year expiry so 2035. The best i could find at the time was November 2033. The expiry is printed on the unit. The serial number can also be derived to determine expiry (upload ebay picture of serial number into grok or gemini for example and ask for expiry). Do not buy any unit new or old without confirmation of expiry date.
I'm looking at doing the same thing. I have one expiring in January and the others not for 5+ years. Were there any issues adding the one you bought even though Google has discontinued them?
Dec 5, 2025 6:31 PM
1.2K Comments
Joined Dec 2010
REALid10tDec 5, 2025 6:31 PM
1.2K Comments

Our community has rated this post as helpful. If you agree, why not thank REALid10t

Other than data mining, there is nothing that Google loves more than ending support early for their products.
1
1
Dec 5, 2025 6:34 PM
1.2K Comments
Joined Jul 2015
darius11Dec 5, 2025 6:34 PM
1.2K Comments
Quote from marquinhocb :
I can tell you first-hand the false alarms are a problem - 1am wakeup, all the kids woken up in whole house, after replacing nest protect with one of these. Returned after that. Going to try the one by Place home solutions now.
Hmm. Our Nest Protects had a false alarm around 1 am recently after having these for many years with zero false alarms. Funny thing was that we could not identify which Nest triggered the alarm because the app and the voice reverted to the basic "bedroom" while we have given each custom names. We do not have this product.
Dec 5, 2025 6:55 PM
287 Comments
Joined Aug 2005
TachyDec 5, 2025 6:55 PM
287 Comments
I had bought 2 non-wired, and 1 of them went off many times the first night they were installed, saying it was detecting smoke. Clearly a false alarm. Finally woke up in the middle of the night and took the battery out. I did wind up returning them to First alert. I had had 5 Nest alarms for 10 years without one false alarm. I did buy 3 Kidde alarms that were pretty basic and installed them in 2 of the rooms, but then did get 2 wired First alerts 3 months ago directly from First Alert, and have not had a false alarm with those (yet). I spent $129 for each of mine, so at least cost-wise this is a good deal. I wish Costco had had them on sale 4 months ago when I had bought mine. The jury is still out about the false alarm thing.
Dec 5, 2025 7:54 PM
710 Comments
Joined Jan 2017
greysterDec 5, 2025 7:54 PM
710 Comments
Quote from wpride33 :
I'm looking at doing the same thing. I have one expiring in January and the others not for 5+ years. Were there any issues adding the one you bought even though Google has discontinued them?
everything still works. No issues adding. Google is still supporting it, just not making any new units.

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Dec 5, 2025 8:13 PM
287 Comments
Joined Aug 2005
TachyDec 5, 2025 8:13 PM
287 Comments
Quote from wpride33 :
I'm looking at doing the same thing. I have one expiring in January and the others not for 5+ years. Were there any issues adding the one you bought even though Google has discontinued them?
I chose to add mine using the First Alert app, and it was pretty easy. Figured I would phase out the Nest app entirely once I switched all units over. (I had not upgraded to the Google app yet).

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