KIDDE Worry Free Battery-Powered Smoke and Carbon Monoxide Alarm with Voice Alarm

The KIDDE Worry Free Smoke and Carbon Monoxide Alarm features a voice warning system and is powered by a sealed lithium battery. Its voice warning system features photoelectric and electrochemical sensing technology with a Smart Hush feature. This combination alarm combines the detection capabilities of a photoelectric sensor with an electrochemical sensor in order to detect CO. When either sensor notices a potential hazard, it will communicate with the other. Depending on what is detected, the alarm will adjust its smoke sensitivity in order to better discriminate between a real hazard and a false alarm.The KIDDE Carbon Monoxide Alarms sealed in lithium battery powers the unit for the entirety of its 10-year life, eliminating the need for battery replacement and worry about unauthorized battery removal. The alarm provides continuous protection from smoke and carbon monoxide, even during power outages. It will also automatically activate when it is attached to the mounting bracket with no pull-tabs or switches necessary. Product Features: Combination smoke and carbon monoxide alarm Voice alarm system Sealed-in lithium battery 10-year battery life Photoelectric sensor Self-activation Test/Hush button Smart Hush feature LED screen End-of-life warning End-of-life hush UL217 AND UL2034 listed Includes smoke and carbon monoxide alarm (Model 21026065)