LG -G510 User Manual page 157

You can set the following menus for your convenience and
preferences.
Press [Menu] in standby mode.
Press for direct access to enter Setting.
You can set the phone to alarm at a specified within this menu.
You can set the time (Hour and Minute) for raising the alarm.
Enter the menu.
Select Enable by pressing
time you want.
Press [OK].
Select the repeat period:
If you set in Power off alarm, the alarm signal sounds at the time
you set even if the phone is turned off.
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[Select], and then enter the alarm
, and .