ViewSonic VA2215-H-7 User Manual page 19

Key Description
Press and hold the key for 5 seconds to lock/unlock the Power
►
button.
When the menu appears on the screen, continue holding both
keys for 10 seconds to lock/unlock the
If the Power
the screen:
Press and hold the key for 5 seconds to display/hide the boot up
▲
screen when the device is turned on.
Power Lock/Unlock
Locking Power Button
Press and hold for 10s
to lock power
button is locked, the below message will appear on
Power Lock/Unlock
Power Button Locked
Boot Up Screen On/Off
Press to turn on
19
Power
button.
3
Off