There is a 1.35mm DC jack port for an external power supply but its related directly to the 5V line Therefore if you should externally power, we propose prying open the case and chopping the pink 5V line through the https://socialbraintech.com/story3328875/the-basic-principles-of-iogear-2-port-full-hd-kvm-switch-with-hdmi-and-usb