SilverCrest SBTH 4.0 A1 Manuel D'utilisation Et Informations Sur Les Services page 47

wait (approx. 2 hours) until the headphones have reached ambient
temperature before use
 the headphones are never subjected to excessive shocks and vibrations
 the headphones are never covered while they are charging as they can
become heated
 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.
Never try to open the housing of the headphones. This would void your
warranty.
SilverCrest SBTH 4.0 A1
English - 45