The Kidde i12010S comes with a sealed lithium battery backup and offers ten years of worry-free protection. There are 2 LED lights, red for alarm mode and green when AC power is present. May be interconnected with up to 24 other Kidde products.
Power Source: 120 VAC w/ Sealed Lithium Battery
Audio Alarm: 85 dB at 10 ft
Size: 5 1/2″ x 1 3/4″
Weight: .45 lb
Warranty: 10-year limited
Note: Cannot ship to AK, HI, PR, or Catalina.