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This black adapter converts a USB 3.0 20-pin male header to a USB 2.0 9-pin female connector, offering a simple and reliable interface conversion solution for desktop motherboards. Featuring a compact portable structure, it occupies minimal internal chassis space and allows easy plug-and-play installation. Precision crafted pins ensure stable and consistent signal conduction with great compatibility for mainstream motherboards and chassis wiring setups. Durable outer casing guarantees long term use, ideal for PC assembly, hardware upgrade and internal USB interface adaptation.