Dell UltraSharp U4919DW User Manual page 60

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.
Firmware Displays the firmware version of your monitor.
Service Tag Displays the service tag serial number of your monitor.
Reset Others Reset all settings under the Others menu to the factory
preset values.
Factory Reset Reset all settings to the factory preset values.
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60 Operating the Monitor