BRK Electronics First Alert 4120 120V AC Hardwired Ionization Smoke Alarm (Upgraded to SMI100-AC)

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BRK 4120 Smoke Alarm AC Powered. Designed for the fastest possible installation!. Ionization Sensor Quick Plug-In Power Connector Alarm Indication Mounting Bracket Lock AC Power In dicator 10-Year Limited Warranty On Alarm Model # 4120 Operating Voltage 120V AC 60Hz Interconnections Up to 11 additional BRK smoke detectors and 6 compatible devices such as bell, repeaters, or switches. Listing UL Listed to U.S. and Canadian safety standards Show more