Mio C230 User Manual page 146

Tap the check box (√) to turn on the power saving mode. Tap the up/down button
to set the timer to 10 seconds, 30 seconds, 1 minute, or 5 minutes. During the
playback, the screen will automatically blank out if you haven't tapped the screen
within the preset time (30 seconds by default).The screen will restore when you
press the power button or when the playback of the current play list has ended.
Tap to save any changes you have made and return to the control panel.
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