TWO BELL OUTPUTS 

In the diagram below we have a panel with two bell outputs, one for the bell on the outside of the premises and one for the inside. Apart from giving more noise having two bell outputs has some other uses, for example:

During the day when the system is switched off it is not necessary to activate both bells if the tamper loop is broken. In fact only the inside bell will sound to give an indication to the People on the premises that something is wrong with the system.
(Please See Chart Below)

CONTROL PANEL FEATURING TWO BELL OUTPUTS

Table shows the type of activation that occurs with the system on or off

(Full Activation Means Both Bells)