LG 27MK600M-W Owner's Manual page 27

The model and serial number of the product are located on the back and
on one side of the product.
Record them below in case you ever need service.
MODEL
SERIAL
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.