Dell P2722HE 27" 16:9 USB Type-C IPS Monitor - Manual (Page 35)

Setting up the monitor
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Connecting the RJ45 cable (optional)
NOTE: The RJ45 cable is not an in-box standard accessory.
Dell Power Button Sync (DPBS)
Your monitor is designed with Dell Power Button Sync (DPBS) feature to allow you
to control PC system power state from the monitor power button. This feature is
only supported with Dell platform which has built-in DPBS function, and is only
supported over USB-C interface.
To make sure the DPBS function works for the first time, perform the following
steps on the DPBS supported platform in the
Control Panel first.
NOTE: DPBS only supports the USB Type-C upstream port.