The Ultimate Cheat Sheet on Youtube增加訂閱
http://garrettnpgf821.theglensecret.com/10-tell-tale-signs-you-need-to-get-a-new-youtube-mai-ding-yue
Even cables with designed-in repeaters normally make it possible for for an external power supply to become connected. This is certainly just a bit extra protection to your signal and may be a good suggestion according