I bought a few boxes of stuff last week and they have both SVP and Unitrol sirens in them. I have little experience with either brand. Do I need the amps for the Unitrols to work? There are two "new in box" FS/Unitrol control switches that don't seem to be part of the sirens but the plugs on the switches match the panels/amps. One of the sirens seems to be missing the "manual" button. Is somebody willing to tell me what I have? Also the SVP has some in the box stuff too,
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