TechniSat DIGITRADIO 231 OD Manual page 129

> Press the MODE button as often as required until [AUX] appears on the display.
> Play music on an external playback device.
> The volume can be adjusted using the Volume buttons +/-, or using the volume
control on your external playback device.
Do not set the volume on the external playback device too low, otherwise
background noise may occur.
12 Other functions
12.1 Sleep timer
You can activate the sleep timer if you want the DIGITRADIO 231 OD to switch to
standby or switch off automatically after a specific time.
> Press the SLEEP button as often as required until the desired time to switch off is
shown on the display.
Alternatively:
> Open the main menu by pressing and holding the INFO/MENU button.
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