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Let your USB 3.0 20pin device connected the USB 2.0 motherboard.
Let your USB 2.0 9pin device connected the USB 3.0 motherboard.
Data speed: 480Mbps for USB 3.0 device.
The package included : 1pc Reversible USB 2.0 9Pin Housing Adapter ; 1pc Motherboard USB 3.0 20pin Header Female Adapter.