Silvercrest SBF 2 A1 Bedienungs- Und Sicherheitshinweise Seite 53

The user of the product is fully responsible for
correcting interference caused by such unauthorised
modification of the product, as well as replacement of
such products .
A warning with this symbol is to indicate
that always remember that excessive sound
pressure or volumes from headphones or
earphones can lead to damage to the
hearing . Always adjust the volume to a
pleasant, not too loud level . If you have
adjusted the volume of the headphones to be
too high and use that for an extended period,
it can damage the listener's hearing .
NOTE: Only use USB cables with a maximum
length of 3 metres to avoid interferences .
GB/IE 53