Search  for anything...
First Alert

First Alert Battery Combination Smoke & Carbon Monoxide Alarm

Based on 0 reviews
Condition: New
Checking for the best price...
$124.99

Buy Now, Pay Later

As low as $20.83 / mo
  • – 6-month term
  • – No impact on credit to apply
  • – 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, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. 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 Thursday, Nov 5
Order within 22 hours and 19 minutes

Available payment plans shown during checkout

Protect Your Purchase

Easy claims online, fast replacements, no fees

Checking for protection plans...

Recently Viewed

At a glance

Condition
New
Size
3-Pack
Style
Precision Detection
Pattern
SMCO100
Dimensions
2.5"D x 5.75"W x 5.75"H
Weight
1.6 lb
Color
White

Features 5

  • 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

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.

Specs 19

Brand First Alert
Style Precision Detection
Power Source Battery Powered
Color White
Product Dimensions 2.5"D x 5.75"W x 5.75"H
Item Weight 1.6 pounds
Alarm Smoke, CO
Sensor Type Photoelectric

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Nov 5

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
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

Buy
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
Easy install and shower steam does not set it off
Size: 1-Pack Style: Precision Detection Pattern Name: SMCO100
So I needed a smoke and CO2 detector that would not go off every time someone showered. The steam was setting off the old one. This one is perfect and solved the problem. Also like that it takes standard batteries.
Reviewed in the United States on January 21, 2026 by TimB
Smoke and Carbon Detector
Size: 1-Pack Style: Precision Detection Pattern Name: SMCO100
Received as promised and as described. Works as it should and overall please with this purchase.
Reviewed in the United States on January 29, 2026 by Amazon Customer
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
Great price and fit!
Size: 1-Pack Style: Precision Detection Pattern Name: SMCO100
Great brand easy to install! Be mindful of the difference between just smoke and CO and smoke detectors! Other than that, excellent purchase - better price point than local hardware stores.
Reviewed in the United States on January 11, 2026 by Miguel Varela Acosta
Can’t go wrong with first alert. Piece of mind.
Size: 3-Pack Style: Precision Detection Pattern Name: SMCO100
A member of our family had a close call with some Co2 recently. This prompted me to get six of these first alert combo detectors. Installation is very straightforward. I now have one in every bedroom and the hallway and the kitchen. The fact that they are battery operated is a big plus. No wiring no electric electricians just two screws and you are done. I know that first alert has a stellar reputation for safety and Quality. I have already read some of the reviews of the Great customer service and warranty provide provided as well. I just installed them so I can’t give you long-term reviews, however so far so good. ... show more
Reviewed in the United States on January 4, 2026 by David McKean
Good product
Size: 1-Pack Style: Precision Detection Pattern Name: SMCO100
Works for us, no issues over the last few months.
Reviewed in the United States on January 22, 2026 by Kindle Customer
Just what we wanted
Size: 3-Pack Style: Precision Detection Pattern Name: SMCO100
Items were received very quickly and just what we wanted the combo fire and carbon monoxide are perfect at a great price
Reviewed in the United States on February 4, 2026 by Shari S
How it works
Checking for best price...