First Alert 1039879 Smoke Alarm and Carbon Monoxide Detecto

This First Alert combo home safety pack will help protect your family from fire and carbon monoxide; the pack includes one First Alert carbon monoxide detector and one First Alert smoke alarm, both battery-operated for continuous monitoring even in the event of a power outage. The carbon monoxide detector features electrochemical sensing technology to detect leaks from multiple sources, while the smoke alarm uses an ionization sensor to provide an early warning of a fast-flaming fire. Both units features a loud 85-decibel alarm, a single test/silence button, and an end-of-life signal so you know when to replace the unit.