Kidde AC/DC Ionization Smoke Alarm

These Interconnect Ionization Smoke Alarms can be operated as a single station unit or interconnected with up to 24 Kidde devices on one wiring system. Ten-year warranty.Unit Number: 21006378 Power Source: 120VAC with 9V Battery Back Up Sensor: Ionization Audio Alarm: 85dB at 10 ft. Temperature Range: 40°F to 100°F Humidity Range: 5%-95% relative humidity Size: 5.6" Diameter x 1.55" Depth Weight: 1 lb Interconnect: Up to 24 Kidde devices LED: Red, normal operation; Green, indicates AC power Digital Display: No Warranty: 10 year limited Interconnect system should not exceed the NFPA interconnect limit of 12 smoke alarms Smart Button - One button does it all (Test and Hush) Smart Hush® - Will temporarily silence nuisance alarms and will not allow hush to be activated unless unit is in alarm Silent Hush® - Will not chirp while in hush mode Alarm memory with battery run down protection; Originating alarm flashes red LED, which will shut off if AC power is not present and th