First Alert Battery Combination Smoke & Carbon Monoxide Alarm

Price: $124.99
(as of Sep 20, 2026 15:29:53 UTC – Details)


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.
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 it’s time to replace the alarm
Customers find the smoke and carbon monoxide alarm to be of good quality and recommend it for home safety, considering it a great deal. The reliability receives mixed feedback – while some say it works great, others report a 33% failure rate after one year. The battery life is also mixed, with customers appreciating that it has replaceable batteries, though one customer notes that they run down quickly.