There is a port for an external power supply but its linked on to the 5V line so if you'll want to externally power, we advocate prying open the situation and reducing the red 5V line from the USB connection.
Our https://umairhxwv483131.tribunablog.com/not-known-details-about-iogear-2x4-usb-3-1-gen-1-type-a-peripheral-sharing-switch-44748907