The Kidde Ionization Firex® I4618 smoke alarm features a Smart Hush™ button, an alarm memory indicator, and a front-loading battery door for ease-of-access.
Power Source: 120 VAC
Battery Backup: 9V carbon zinc battery
Audio Alarm: 85 dB at 10 ft
Size: 5 5/8″x 1 13/16″
Weight: 8 oz
Interconnect: Up to 24 Kidde devices
Warranty: 5-year limited