The Kidde Ionization smoke alarm automatically activates when attached to mounting bracket and is run by a 10-year sealed lithium battery.
Power Source: Lithium-metal battery (included)
Audio Alarm: 85 dB at 10 ft
Size: 5″x 1 11/16″
Weight: 10 oz
Warranty: 10-year limited
Note: Cannot ship to Alaska, Hawaii, Puerto Rico, or Catalina.