First Alert 1046882 Smoke and Carbon Monoxide Alarm, Alarm: Audible, Visual, Electrochemical, Ionization Sensor, White White

Install convenient two-in one protection against both smoke and carbon monoxide with the First Alert SMICO105-AC interconnect hardwire combination smoke and carbon monoxide alarm with 10 years battery backup. Meets new industry standards and can interconnect with other compatible alarms to create a whole home alarm system to help provide an early warning.