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The Shure PGA31 is a headset (head‑worn) condenser microphone, primarily intended for vocal/speech and live performance (e.g. singing, presentations) use.
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It is designed to work with wireless bodypack transmitters (it has a TA4F / TQG 4‑pin connector) rather than being used directly as a standalone wired XLR mic.
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Its form factor is a wireframe headset with a flexible gooseneck boom mic that allows precise placement.