MSI WS65 - Speaker Volume Control; Keyboard Backlight Brightness

User's Manual
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Adjust the Sound Level of the Speaker
+
Increase the built-in speaker’s volume.
+
Decrease the built-in speaker’s volume.
+
Mute the built-in speakers.
Adjust the Brightness Level of the Keyboard Backlight LED
(optional)
+
Increase the brightness level of the keyboard backlight LEDs.
+
Decrease the brightness level of the keyboard backlight LEDs.