LG 22SM3B-B Owner's Manual page 19

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 equipment is compliant with
Class A of CISPR 32. In a residential environment
this equipment may cause radio interference.
Temporary noise is normal when powering ON
or OFF this device.