TechniSat DIGITRADIO Bike 1 Manuel D'instructions page 30

If the volume is turned down completely (mute) in Bluetooth mode, the device
switches to standby mode after approx. 15 minutes.
4.6.5 Display
Depending on the selected function or option, the following information is shown on the
display:
Channel name,
frequency, menu
name
Display indicators,
menu options,
volume
30