The Kidde 0918E Ionization DC Smoke Alarm is powered by one 9-Volt battery. Since there is no wiring required, there will be no loss of protection should the power go out for any reason. Exit Lights are included on this smoke alarm to help people find their way out in case of a fire.
Power Source: (2) 9V batteries (included)
Audio Alarm: 85 dB at 10 ft
Size: 5″ x 1 1/2″
Weight: 13 oz
Warranty: 5-year limited