Brk Electronics Smoke Detector 4120B Home Depot / Smoke alarms have a limited life.. Brk first alert 9120b smoke detector. 120v ac 60hz w/ 9v battery backup (4120b only). By 1967, brk electronics marketed the first smoke detector and alarm commercially. Model 4120b 4120sb ac powered ionization smoke alarm with. This unit is designed to be compatible with:
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Used the new base mount that fit exactly the same as the old base mounts that had yellowed over time.
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Model 4120b 4120sb ac powered ionization smoke alarm with.
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