LG LG10SM3TBB Owner's Manual page 26

The product label contains necessary information for
after-service.
Model
Serial No.
WARNING -This is a class A product. In a domestic
environment this product may cause radio
interference in which case the user may be required
to take adequate measures.
Please note that a momentary noise during power
on/off is not abnormal and does not mean a
device malfunction.