The Dell DA20 DA20u Multi-Port USB (MPN V1J4H) is a hub for connecting a laptop to USB devices and an HDMI display. It brings USB-A, USB-C and HDMI together, so peripherals can connect through USB while video goes to an HDMI display.
For laptop use, its video capability depends on the connected computer. With HBR3 and HDMI 2.0 support, it can deliver 4K at 60 Hz. With HBR2, video is limited to 4K at 30 Hz because bandwidth is shared between video and USB data.
This setup is useful when a laptop needs USB connections alongside an HDMI screen. USB-A and USB-C serve peripherals, while HDMI provides the video output. The description applies to the Dell DA20 DA20u, MPN V1J4H.