TechniSat DIGITRADIO 230 OD Mode D'emploi page 78

In the event of extended transportation in the cold and a subsequent change to
warm rooms, do not switch on immediately; wait for the temperature to equalise.
If water has penetrated the device, switch it off and inform the Service
Department.
Do not expose the device to heat sources that will heat it up more than normal
use.
In the event of a thunderstorm, disconnect the device from the mains.
Overvoltage can damage the device.
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