You will find a port for an external power source but its related directly to the 5V line Therefore if you might want to externally power, we advise prying open the situation and slicing the pink 5V line through the USB https://harmonyhwda569146.nizarblog.com/30532421/5-tips-about-iogear-2x4-usb-3-1-gen-1-type-a-peripheral-sharing-switch-you-can-use-today