LG 24MK4 Series Owner's Manual page 29

Make sure to read the Safety Precautions before using the product.
Keep the Owner's Manual (CD) in an accessible place for future
reference.
The model and serial number of the SET is located on the back and one
side of the SET. Record it below should you ever need service.
MODEL
SERIAL
（for 27MK4 series）
ENERGY STAR is a set of power-saving
guidelines issued by the U.S.Environmental
Protection Agency(EPA).
As an ENERGY STAR Partner LGE U. S.
A.,Inc. has determined that this product
meets the ENERGY STAR guidelines for
energy efficiency.
Refer to ENERGY STAR.gov for more information
on the ENERGY STAR program.