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the contrast.
The contrast setting range, which
adjusts the brightness of the
screen, is 0 to 20.
the power off time.
The setting range is 1 to 15 seconds.
The power will turn off after the set time if no
button is pressed when the playback ends.
the default volume.
The default volume setting range of the unit is
0 to 25. The device returns to the volume set by
a user, when the power is turned on again after
the volume goes up beyond the range.
The device returns to the earlier volume, each
time the power is turned on within the range.