Silvercrest SUR 1 A1 Operation And Safety Notes page 45

DANGER! Risk of electric shock!
Only use the product in dry indoor rooms.
Polarity of barrel connector.
CAUTION! EXPLOSION HAZARD! A
warning with this symbol and word "CAUTION!
EXPLOSION HAZARD" indicates the potential
threat of explosion. Failure to observe this warning
may result in serious or fatal injuries and potential
property damage. Follow the instructions in this
warning to prevent serious injuries , a danger to life
or property damage!
Protection class II. The power adaptor has a
double insulation.
GB/IE 45