Search  for anything...
First Alert

First Alert SMCO100 Battery-Operated Combination Smoke & Carbon Monoxide Alarm - 3 Pack

  • Based on 30,647 reviews
Condition: New
Checking for the best price...
$110.30 Why this price?
Save $19.69 was $129.99

Buy Now, Pay Later

As low as $18.38 / mo
  • – 6-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Afterpay, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

FREE 30-day refund/replacement

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.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Sunday, Sep 21
Order within 4 hours and 58 minutes
Available payment plans shown during checkout

Recently Viewed

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: 1.55 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: ‎1.55 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: Sunday, Sep 21

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.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Essential Safety Solution: First Alert Powered Alarm SCO5CN
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! 🏠🔥🚨 ... show more
Reviewed in the United States on February 10, 2024 by Eric
    • Easy to install/Worth the cost/ As described
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
    • Excellent smoke detector
Size: 1-Pack Style: Standard Detection Pattern Name: SCO5CN
Excellent product, I have replaced all the smoke detectors in my rentals with this one and works great!
Reviewed in the United States on July 24, 2025 by Lorant B.
    • Good smoke alarm, great warranty!
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
    • Easy install, new style harness, works great.
Size: 1-Pack Style: Precision Detection Pattern Name: SMCO100
Works great and easy to wire to the new harnesses. Replaced a malfunctioning old one that was chirping even with new batteries, but no problems at all with this bad boy. Hoping for a solid ten years before replacing.
Reviewed in the United States on July 15, 2025 by Garrett Zecker
    • So far, so good!
Size: 1-Pack Style: Standard Detection Pattern Name: SCO5CN
I had a $120 Google Nest Protect previously and it malfunctioned and I believe requires a good wifi connection to really work properly. I wanted something simple and reliable so switched to the this First Protect. So far so good. No false alarms yet and installation was straightforward. They even included drywall anchors, something that was not even included with the Nest Protect. Just drill a 3/16 hole and then lightly hammer the drywall anchors in, then screw the mounting bracket in to the anchors using a phillips screwdriver. You can also rotate the First Alert in it's mounting bracket so that the words line up exactly how you like them. No one likes a smoke detector mounted on the wall with the lettering skewed or upside down. You do not have to screw the unit on the mount all the way in order for it to be secure. The features are simple and to the point, just write down in your smartphone or wherever what the different beeps mean because you will probably forget later on. There are only a few different beep sequences so it's not overly complicated but you will want to know for example when it's telling you the battery needs replacement vs. when it's at the end of it's life cycle. This is an inexpensive, simple and relatively attractive unit, although I really wish smoke detector companies would put more effort in to beautiful designs. That's one of the things I like better about the Nest Protect. ... show more
Reviewed in the United States on October 22, 2020 by Mediahound 🎧
    • Easy to install
Size: 1-Pack Style: Precision Detection Pattern Name: SMCO100
Very easy to install. Just install the base first on the ceiling with a couple of screws and then the detector fits right in on the base. When the battery gets low, it gives a warning beeping sound so I know when to change out the battery.
Reviewed in the United States on May 20, 2025 by Amazon Customer
    • Buying it second time, the first sensor worked exactly 10 years with batteries replacement
Size: 1-Pack Style: Precision Detection Pattern Name: SMCO100
Buying it second time, the first sensor worked exactly 10 years with batteries replacement.
Reviewed in the United States on September 15, 2025 by Amazon Customer

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...