First Alert SMCO100 Battery-Operated Combination Smoke & Carbon Monoxide Alarm - 3 Pack
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FREE refund/replacement until Jan 31, 2026 Learn more
This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2026
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Availability:
Only 4 left in stock, order soon!
Arrives
Monday, Nov 24
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Size: 3-Pack
Style: Precision Detection
Pattern Name: SMCO100
Features
- First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency
- Provides reliable 2-in-1 protection against both smoke and carbon monoxide
- Battery-operated alarm allows for easy installation and maintenance
- Test/silence button for efficient testing to ensure alarm is working properly
- End-of-life warning lets you know when its time to replace the alarm
Description
The First Alert SMCO100 Battery-Operated Combination Smoke & Carbon Monoxide Alarm is equipped with First Alert's Precision Detection advanced sensing technology and meets new industry standards. This 2-in-1 smoke and carbon monoxide alarm provides reliable protection against both threats and is easy to install and maintain.
Brand: First Alert
Style: Precision Detection
Power Source: Battery Powered
Color: White
Item Weight: 1.6 Pounds
Alarm: Smoke, CO
Sensor Type: Photoelectric
Number of Items: 3
Manufacturer: Resideo
UPC:
Brand: First Alert
Style: Precision Detection
Power Source: Battery Powered
Color: White
Item Weight: 1.6 Pounds
Alarm: Smoke, CO
Sensor Type: Photoelectric
Number of Items: 3
Manufacturer: Resideo
UPC: 029054022080
Part Number: SMCO100
Item Weight: 1.55 pounds
Product Dimensions: 21.5 x 7.5 x 3.5 inches
Item model number: SMCO100
Batteries: 2 AA batteries required. (included)
Size: 3-Pack
Pattern: SMCO100
Item Package Quantity: 1
Included Components: AA Batteries
Batteries Included?: Yes
Batteries Required?: Yes
Battery Cell Type: Alkaline
Date First Available: October 26, 2023
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Monday, Nov 24
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
Size: 1-Pack
Style: Standard Detection
Pattern Name: SCO5CN
Excellent alarm. It was easy to install, the alerts are loud and clear, and I appreciate having both smoke and carbon monoxide detection in one unit. It feels reliable and well-made, giving some extra peace of mind. Definitely worth the purchase
Reviewed in the United States on November 17, 2025 by Aaron
Size: 1-Pack
Style: Standard Detection
Pattern Name: SCO5CN
⭐⭐⭐⭐⭐ The First Alert Powered Alarm SCO5CN has become an integral part of my home's safety system, providing reliable protection against both smoke and carbon monoxide. Here's why I give it a solid 5-star rating: Dual Protection: This combination smoke and carbon monoxide detector offers peace of mind by safeguarding my family and home against two common household hazards. With one device, I have comprehensive protection against both smoke from fires and carbon monoxide leaks. Reliable Performance: First Alert is a trusted name in home safety, and the SCO5CN lives up to the brand's reputation for reliability. It detects smoke and carbon monoxide quickly and accurately, emitting loud alarms to alert occupants in case of an emergency. Battery Operated: The battery-operated design ensures continuous protection even during power outages. I appreciate the added reliability and convenience of not having to worry about the detector losing power during emergencies. Easy Installation: Installing the SCO5CN is a breeze. With no wiring required, I was able to mount it in minutes using the included mounting bracket and screws. The simple setup process means I can quickly and easily enhance the safety of my home without any hassle. Sleek Design: The sleek, white design of the SCO5CN blends seamlessly with my home decor. Its low-profile design and compact size make it unobtrusive while still providing essential protection. In conclusion, the First Alert Powered Alarm SCO5CN is an essential safety device for any home. With its dual protection against smoke and carbon monoxide, reliable performance, battery-operated design, easy installation, and sleek appearance, it offers everything I need to keep my family and home safe. Highly recommended! 🏠🔥🚨
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Reviewed in the United States on February 10, 2024 by Eric
Size: 1-Pack
Style: Precision Detection
Pattern Name: SMCO100
It works
Reviewed in the United States on November 13, 2025 by Jennifer kaus
Size: 1-Pack
Style: Standard Detection
Pattern Name: SCO5CN
Good smoke/CO detector, malfunctioned after a couple years. I called the company and given their generous warranty policy, they replaced it with the new model for free, just had to pay a few dollars for shipping.
Reviewed in the United States on June 23, 2025 by sol lazarus
Size: 1-Pack
Style: Precision Detection
Pattern Name: SMCO100
Purchased home and have replaced the original builder alarms with this. Works great and trusted.
Reviewed in the United States on October 23, 2025 by LW
Size: 1-Pack
Style: Standard Detection
Pattern Name: SCO5CN
Nvm. I thought it was battery-less, but I just found the slot on the side for 2 AA batteries. Works like a charm now! Hmm…. My 10-year alarm went out after 1.5 years. Not sure if I got a dud or if this is a known pattern.
Reviewed in the United States on October 8, 2025 by Amazon Customer
Size: 1-Pack
Style: Standard Detection
Pattern Name: SCO5CN
I really like that this smoke detector includes Carbon Monoxide (CO) detection with it. The upside of this is that in replacing an old smoke detector, I now have extra protection against CO leaks. The downside of this is that this unit only lasts for approximately 7 years according to the user manual included with the unit. At roughly 7 years (which I assume is roughly as the unit does not have a precise time keeping setup), the detector will beep at your continuously until you replace it. Note that according to the user manual, you can silence this "End of Life" alarm for 2 days by pressing the button on the unit. So, you could continue using it so long as you tell it to be quiet every two days by pushing its buttons (pun intended). However, the "End of Life" alarm exists for a reason, and as many reviewers (and question answerers) on Amazon have noted, the CO detection functionality will have deteriorated such that you really need a new alarm. The quality of the unit seems good. It is made out of plastic, but seemly high quality and durable plastic. There is a mounting plate (also plastic) that you screw into a wall or ceiling and then the detector unit goes into that mounting plate and locks with a quarter turn. The test alarm sounds loud (which is a good thing for deep sleepers), and the use of AA batteries is a refreshing change. I hated buying 9V batteries just for the smoke detector. It is important to note that I did not evaluate the sensitivity of the CO detector nor experienced a smoky fire (or any fire), so this review assumes both of those listed functions would work properly. Also, I have only owned the product for ~ 1 month so I cannot comment on the reliability or lifespan of its operation. I can testify that I replaced a 30+ year old First Alert smoke detector that was (as far as I know from burning things in the kitchen) still working so I do have high confidence in their brand. I only replaced the old detector for a combination of two reasons: (1) I wanted CO detection and (2) the old one's plastic was yellowing. I think it is also important to point out (although it is well mentioned in the product page) that this detector is NOT for new-er construction homes that have interconnected smoke detectors (i.e. if your smoke detector has a plug in the ceiling that it plugs into).
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Reviewed in the United States on June 23, 2018 by Mike
Size: 1-Pack
Style: Precision Detection
Pattern Name: SMCO100
I gave this review 5 stars because it's exactly what it describes, it's very easy to install and set up. Overall a very user friendly system to install anywhere to make the area safer. It's worth the $50 because it's an investment in safety so overall, it's an exactly as described product.
Reviewed in the United States on July 30, 2025 by Amazon Customer