First Alert SMICO105-AC 2-In-1 Interconnect Hardwire Ionization Smoke & Carbon Monoxide Alarm

First Alert SMICO105-AC Interconnect Hardwire 2-In-1 Ionization Smoke & Carbon Monoxide Alarm with 10-Year Battery Backup. Provides convenient 2-in-1 protection against both smoke and carbon monoxide. Meets industry standards and can interconnect with other compatible detectors to create a whole home alarm system to help provide an early warning.