LG LS50 - Battery Alarm

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Battery alarm:
If the battery power gets down to low alarm, critical alarm, user can define the option
for alarm is working.
Note:
When pressing the keys Fn + F8, it keeps unused sound device power
management(Sound device is always ON).
When pressing one more, it return to the original set point.
When pressing the keys Fn + F9, it keeps unused Monitor power
management(Monitor is always ON).
When pressing one more, it return to the original set point.