The Kidde 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. Includes hush button to silence nuisance alarms.
Power Source: 9V battery (included)
Audio Alarm: 85 dB at 10 ft
Size: 5″x 1 1/2″
Weight: 1 lb
Warranty: 5-year limited