Silvercrest SBKN 4.0 B1 Operating Instructions And Safety Instructions page 32

SilverCrest SBKN 4.0 B1
 the headphones are never subjected to extreme temperature fluctuations as
this could result in condensation and electrical short circuits. If the
headphones were subjected to extreme temperature fluctuations, however,
wait (approx. 2 hours) until the headphones have reached ambient
temperature before use
 the headphones are never subjected to excessive shocks and vibrations
 when using an optional USB power supply, its operating instructions are
observed
 connected cables are always laid in such a manner that nobody can step on
them or trip over them. There is a risk of injury
 no objects are placed on a connected cable and cables are not connected
over sharp edges because they could be damaged otherwise.
WARNING! Maintenance / cleaning
It is necessary to repair the headphones if they have been damaged in any
way, for example, if the housing is damaged, if liquid or objects have
penetrated the device or if the product has been exposed to rain or moisture.
Repair work is also required if the device is not working properly or has been
dropped. If smoke is produced, or there are any unusual sounds or smells, turn
the headphones off immediately. In such cases, the headphones should not be
used until they have been inspected by authorised service personnel. Only
have the device repaired by qualified personnel. Never open the housing of
the headphones.
Only use a clean, dry cloth for cleaning the headphones and never use any
corrosive liquids. Use a slightly damp cloth and a mild cleaning agent to
remove stubborn dirt.
30 - English