BRK 4120B Smoke Alarm Detector with Battery Back-up

Description:	BRK 4120B Smoke Alarm AC Powered with Battery Back-up. Designed for the fastest possible installation! If AC power fails, the battery back-up keeps the smoke alarm working.
Voltage:	120 Volts AC; Interconnectable
Installation:	Easy Install Mounting Bracket
Features:	Ionization Sensor Quick Plug-In Power Connector Alarm Indication Battery Drawer Lock Mounting Bracket Lock Swing-Open Battery Door Battery Activation Tab Battery Back-Up AC Power Indicator Low Battery Warning "Chirp" Missing Battery Tab 9V Battery Included 10-Year Limited Warranty On Alarm
Special Features:	The BRK 4120B can be interconnected with up to 11 additional BRK smoke detectors and 6 compatible devices such as bell, repeaters, or switches.
Certification:	UL Listed to U.S. and Canadian safety standards

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