Alarms like the one in the picture (and variations; System Sensor SpectrAlert Advances with green strobes, Wheelock MTs with blue strobes, etc.) are seen in airports by the gates. What are they for?
those are probably security signals for the gates to prevent people from opening them
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From what I’ve seen when at the airport it will go off if the door is opened without a proper card or code at the gate door. It doesn’t prevent anyone from opening the door since they are locked but if somehow it is opened (without a code) the alarm will sound.
