Kidde Worry-Free Bedroom Sealed Lithium Battery Power Smoke Alarm  P3010B - 21010161 Ideal for bedrooms with 10-year sealed lithium battery and talking voice alarm Hassle-free protection - Goodbye late night low battery chirps! Never replace a battery during the alarms operating life and no need to worry about the batteries being removed. Always on - Sealed-in lithium battery powers alarm for 10 years - the life of the alarm. The right alarm, the right location. - Each of the four smoke alarms includes features designed to address location-specific safety needs, such as an LED light in the hallway. Sealed-In Lithium Battery  Sealed-in lithium power supply; no battery replacement required over the 10 year life of the alarm. Eliminates worry about battery removal or unauthorized deactivation of alarm.