The USB 31 port interface is using the USB 30 pin set and more. It is design to be backwards compatible .There are no official release of the specs for the USB 31 header yet (as of this writing), But first motherboard with this is the MAXIMUS IX FORMULA,STRIX Z270I/Z270G etcThe cable only support usb31/usb30 device, it can' work at USB20(480Mbps)USB 31 require a different front panel header than USB 30.Length: 20cmConnector 1: USB 30 Front Panel HeaderConnector 2: USB 31 Front Panel HeaderMaterial: plasticColor: blackPackage Contents:1 * USB Extension CableOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.