First Alert Hardwire Combination Smoke & Carbon Monoxide Alarm

Price: $64.99 - $53.99
(as of Sep 14, 2026 14:52:37 UTC – Details)


The SMICO100-AC Interconnect Hardwire 2-in-1 Smoke & CO Alarm with Battery Backup utilizes First Alert’s Precision Detection technology and meets new industry standards. Easily install and interconnect multiple alarms together to create an alarm system throughout your home.
First Alerts 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
Through early warning interconnect, when one alarm sounds, all compatible
Quick Connect Plug allows for easy installation with no need to rewire
Battery backup provides continuous protection during power outages
Test/silence button for efficient testing to ensure alarm is working properly
Customers find the smoke and carbon monoxide alarm to be of good quality and easy to replace. However, they report mixed experiences with reliability, with some units malfunctioning after a month of use. Moreover, the accuracy of alarms receives negative feedback, with customers reporting false alarms and defective units. Additionally, customers disagree on the fit, with some finding it perfect while others say it doesn’t match the older model mounting ring, and the wiring compatibility is also mixed, with several customers finding it impossible to connect. The value for money receives mixed reviews, with some considering it worth the price while others describe it as expensive junk.