Regular alarms are typically triggered at the point of entry / forced entry, to discourage the intruders from entering the building.
Silent alarms are triggered during a hostage situation. e.g. when a cashier / bank teller / etc. is in danger because they are being threatened with a weapon. At this stage, it is not advisable to startle the robber because it may cause them to harm the hostage.
Silent alarms are triggered during a hostage situation. e.g. when a cashier / bank teller / etc. is in danger because they are being threatened with a weapon. At this stage, it is not advisable to startle the robber because it may cause them to harm the hostage.