10 Year Smoke & Carbon Monoxide Alarm, Detects Both Carbon Monoxide & Smoke In A Single Device, Install convenient 2-in-1 protection against both smoke and carbon monoxide with the First Alert SMICO105-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with 10-Year Battery Backup. Meets new industry standards and can interconnect with other compatible alarms to create a whole home safety network to help provide an early warning.