LG 22SM3B Owner's Manual page 22

Make sure to read the Safety Precautions
before using the product.
The model and serial numbers of the SET are
located on the back and one side of the SET.
Record it below should you ever need service.
MODEL
SERIAL
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.
Temporary noise is normal when powering ON
or OFF this device.