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First Alert Combination Smoke & Carbon Monoxide Alarm, Battery Operated Detector with Test & Silence Button, SMCO100, 1-Pack,White

Based on 28,033 reviews
Condition: New
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$42.95
Holiday Deal · 5% off was $44.99

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At a glance

Condition
New
Size
1-Pack
Style
Precision Detection
Pattern
SMCO100
Dimensions
5.6"D x 5.6"W x 1.9"H
Weight
0.52 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 20

Brand First Alert
Style Precision Detection
Power Source Battery Powered
Color White
Product Dimensions 5.6"D x 5.6"W x 1.9"H
Item Weight 0.52 Pounds
Alarm Smoke, CO
Sensor Type Photoelectric

Frequently asked questions

This product is currently out of stock. Please check back later for shipping info.

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.

Top Amazon Reviews


Safety first
Size: 3-Pack Style: Precision Detection Pattern Name: SMCO100
They are very easy to install and seem to work.
Reviewed in the United States on May 28, 2026 by 16Paws

No complaints
Size: 1-Pack Style: Precision Detection Pattern Name: SMCO100
Exactly as described! No problems installing or mounting.
Reviewed in the United States on May 21, 2026 by Joshua

Works as designed
Size: 1-Pack Style: Precision Detection Pattern Name: SMCO100
Put the batteries in and its done.....
Reviewed in the United States on May 20, 2026 by TommieT

High Quality
Size: 3-Pack Style: Precision Detection Pattern Name: SMCO100
These word well. I needed to update my current smoke detectors to combo Co2 smoke detectors
Reviewed in the United States on June 3, 2026 by Susan

Fine product
Size: 1-Pack Style: Precision Detection Pattern Name: SMCO100
Works as advertised
Reviewed in the United States on May 28, 2026 by Art A.

price went way up
Size: 1-Pack Style: Precision Detection Pattern Name: SMCO100
so far so good price went up $12 since I bought it wow
Reviewed in the United States on June 6, 2026 by Wendy Leonhardt

No waking up in the middle of the night to false alarms now.
Size: 3-Pack Style: Precision Detection Pattern Name: SMCO100
These were easy to install, and we haven’t had a false alarm even once. Why did we live with the problem so long!
Reviewed in the United States on May 18, 2026 by Amazon Customer

As expected.
Size: 1-Pack Style: Precision Detection Pattern Name: SMCO100
As expected.
Reviewed in the United States on May 18, 2026 by Loren L. England
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