Network Public Address System
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4.2.7 Other operations
On the main interface:
"Invert Selection" button is to cancel the selection of a zone;
"Bell alarm" button is used to broadcast a bell alarm before calling.
"Page Up and Page Down" buttons are used to display the previous and the next page of zone for query
operation.
On the main interface, the "" icon is used to exit the main interface and return to the password input interface.