LG N1A1DD1 - Manual (Page 79)

79
A Connect to Network Storage
Web Menu -> Configuration ->
System -> Click ‘Brightness
and Sound Setting’
A
System Setting
l Brightness and Sound Setting
B
Click on‘Save’
B Able to set up the LCD message and brightness. (N2R5/N2B5 models)
You can turn on/off LED buzzer.