MSI Megabook M660 User Manual page 47

Enable or disable the touchpad function.
+
Decrease the LCD brightness.
+
Increase the LCD brightness.
+
Decrease the built-in speaker's volume.
+
Increase the built-in speaker's volume.
+
Disable the computer's audio function.
+
Force the computer into suspend mode
+
(depending on the system configuration).
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Getting Started