The Ultimate Cheat Sheet on インスタ 再生回数
http://arthurddgz326.cavandoragh.org/20-myths-about-insuta-zai-sheng-hui-shu-snshelper-busted
Even cables with crafted-in repeaters generally allow for for an external electric power supply being hooked up. This can be just a bit further protection for your sign and may be a good idea depending on the condition