First Alert 2 In 1 Protection Smoke Carbon Monoxide Alarm 2 Pack 1544678

First Alert's Precision Detection Advanced Sensing Technology Voice & Location Alerts for Danger and Helps Escape Safely Provides Reliable 2-in-1 Protection Against Both Smoke and Carbon Monoxide Slim Profile Design is Half The Depth of a Standard Alarm 10-Year Sealed Battery, End-Of-Life Warnings to Replacement