There exists a port for an external power supply but its connected straight to the 5V line Therefore if you have to externally power, we endorse prying open the situation and reducing the purple 5V line in the USB https://steveprjv558687.blogrelation.com/36400491/the-ultimate-guide-to-iogear-2x4-usb-3-1-gen-1-type-a-peripheral-sharing-switch