The USBC-PDMON supports USB Power Delivery, which allows the display to either receive power from an external power source (such as a USB Type-C charger) or receive power from the host device. In other words, the display can accept power from both ‘directions’.
The USBC-PDMON also has an internal USB hub which allows you to connect external devices such as USB storage drives.
When the ‘direction’ of the power source changes (for example if you disconnect an external power adapter and allow the host system to power the display), the USB hub inside the display will momentarily reset and the video signal will also be temporarily interrupted.
It is for this reason that we recommend that you ‘eject’ any USB devices connected to the display’s ‘downstream’ USB ports prior to changing the power source of the display.