How to Outsmart Your Peers on Youtube 廣告

http://beaunslj860.image-perth.org/the-most-common-mistakes-people-make-with-youtube-guan-kan-ci-shu

Even cables with built-in repeaters usually allow for an exterior power source to be connected. That is just a bit excess safety for the signal and could be a good idea depending on the predicament where the repeater