First Alert SMICO100 Battery-Operated 2-in-1 Smoke and CO Alarm, Ionization

Combination smoke and carbon monoxide (CO) alarm; provides reliable 2-in-1 protection against both smoke and carbon monoxide Advanced sensing technology complies with the latest industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency 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 combo detector Ionization Includes mounting plate, battery, screws, and manual