Aposonic A-S0402R21 - Manual (Page 58)

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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.