Dell U2422H 23.8" 16:9 IPS Monitor - Manual (Page 72)

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Operating the Monitor
Firmware Displays the firmware version of your monitor.
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 Press the Joystick to reset 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.