Hallway 3-in-1 Smoke, Fire and Carbon Monoxide Smart Alarm with 10 Year Tamper-Proof Sealed Battery

3-in-1 Smart Alarm provides 10 years of continuous protection against fast flaming fires, slow smoldering fires and carbon monoxide Sealed battery (included) will never have to be replaced throughout the life of the alarm Features microprocessor intelligence to virtually eliminate nuisance alarms Quick activation battery pull tab makes the alarm easy to install while the deactivation key makes the batteries safe for disposal Smart Alarm Technology virtually eliminates nuisance alarms