Space Age AV32+2DCD

That is an electromechanical horn on the rear of the strobe plate.

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Potter OSYSU-A2

Potter OSYSU-A2

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I honestly have no idea what this thing is, but it says Potter on it, so that means it goes...
ADT B3407-024

ADT B3407-024

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There exists a strobe which can be attached to alarms like this.
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