@@勝興許 so i used google translate to figure out what you just said. so video was 1985 and you are saying microphones are wired during that time. well i just googled it to verify and found out on wikipedia that wireless microphones has been around since 1945. no exact year when ktv first used wireless mic but it has been around since that year so i guess this answer should be enough. also thank you for the information i learned something new again since i have to do some fast research for this. also if she is doing lipsync for her performance using a wireless mic as a prop is still a good choice since she is dancing as well, which i highly doubt she is doing lipsync.
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