Why does the alarm siren sound during a power failure?

Why is it that when there is a power failure, the external series sounds for a few minutes?
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1 Answer

Answer :

This is because the control panel battery is bad and cannot maintain the correct voltage level in the event of a power outage, so all charging voltage to the outdoor siren will be lost. As a result, the outdoor siren will roar from its own battery until the siren stops. The only problem with this is that if the power comes back on and then goes away again, the siren will start again, shaking the neighbors ’nerves. The solution is to replace the battery in the control panel as soon as possible.     
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