There is a one.35mm DC port for an external power supply but its connected straight to the 5V line Therefore if you need to externally power, we advise prying open the case and slicing the purple 5V line with the USB https://laramcoq257230.blogdigy.com/not-known-factual-statements-about-iogear-2x4-usb-3-1-gen-1-type-a-peripheral-sharing-switch-42798172