Aposonic A-S1602R25 - Manual (Page 85)

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Following is a brief description for the operations:
▲▼◄►
Press these buttons to move the Mask window.
+/- (Mouse: Left click and drag)
Press these buttons to resize the Mask window.
ENTER (Mouse: )
Press this button to set/reset the area under the Mask window. The area set
will be shown with semi-transparent gray area.
MODE (Mouse: )
Press this button to set/reset the whole video area.
ESC (Mouse: or Right Click)
Press this button to escape from Motion Area Setting screen, and return to
Smart Search screen.