Ionization Technology: Better at detecting fast flaming fires. 120V AC Direct-Wire. Interconnects with up to 24 units, of
which 18 can be initiating. 9V Battery Backup (included), continuous protection in case of power failure. Test Button: Tests circuitry and verifies alarm operation. Hush® Button, quickly silences nuisance alarms. Low Battery Indicator, warning chirp sounds when battery needs replacement. Interconnectable, any unit that senses a problem automatically triggers all units throughout the home immediately, allowing extra time for escape. Audio Alarm: 85dB. 5-year Warranty.
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