close jack plug cables connected with old box wireless microphone conference meeting room |
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| navigate by keyword : amplifier audio background black blur box broadcast business cable cables close communicate communication concept conference connect connected connection control education electric electronic equipment hall input instrument jack link meeting metallic mic microphone mixer music musical object old people plug projector public record room screen seminar send silver socket sound speaker switch table technology voice wire wireless |
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| Close up Jack plug cables connected with old box of wireless microphone in conference meeting room seminar business blur. |
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