Dell S2721QSA User Manual page 58

LCD Helps reduce minor cases of image retention.
Conditioning Depending on the degree of image retention, the
program may take some time to run. You can enable
this feature by selecting On.
Service Tag Displays the service tag of your monitor. This string is
required when you look for phone support, check
your warranty status, update drivers on Dell's
website, etc.
Reset Others Resets all settings under the Others menu to the
factory preset values.
Factory Reset Restore all preset values to the factory default
settings. These are also the settings for ENERGY
®
STAR tests.
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58 Operating the monitor