AVUE AVL104MDE – 10.4” LCD Monitor - Manual (Page 9)

9
(6) Source
To switch the video inputs, (or sub picture source in pip mode) This button is also
used as “Enter” and “Select” function in the OSD menu and to confirm your
selected settings in the OSD menu.
KEY Lock Function:
Into key lock mode:
Push “Menu” and “Item” after the LED flashes, OSD of screen will show
“Key Lock”.
Into key unlock mode:
Push again after the LED flashes, OSD of screen will show “Key Unlock”.