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Smoke Alarm - BRK Model 4120SB Teardown

The BRK & First Alert 4120 was introduced in 1998. It was replaced by the BRK 9120 in 2004 [3].

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Front of BRK Smoke Alarm Model 4120.
Front of BRK/First Alert Smoke Alarm Model 4120.
BRK 4120 Specifications
BRK/First Alert Model 4120 Specifications on Box.
Back of BRK Smoke Alarm Model 4120
Back of BRK/First Alert Smoke Alarm Model 4120 .
Inside the BRK Smoke Alarm Model 4120
Inside the BRK/First Alert Smoke Alarm Model 4120.
Horn & Ionization Chamber - BRK Model 4120 Smoke Alarm
Side View of Horn and Ionization Chamber - BRK/First Alert Model 4120 Smoke Alarm.
Back of PCB Board - BRK Smoke Alarm Model 4120
Back of PCB Board - BRK/First Alert Smoke Alarm Model 4120.

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