The Kidde PE120E smoke alarm can alert you to the danger of fire. It comes with a low-battery indicator so you know when its time to make a replacement.
Power Source: 120 VAC w/ 9V battery backup (battery included)
Audio Alarm: 85 dB at 10 ft
Size: 5 5/8″x 1 9/16″
Weight: 1 lb
Interconnect: Up to 24 Kidde devices
Warranty: 10-year limited