Let your USB 2.0 device connected the USB 3.0 20pin motherboard. For example, when your case owns 9pin female cable to front panel, but the motherboard only has 20pin connector.
Feature:
Type: USB3.0 19/20 pin Female to USB2.0 9/10 pin Male Adapter Cable.
Connector A: USB2.0 9/10 pin Male.
Connector B: USB3.0 19/20 pin Female.
Length: 15cm.
Color: Black.
Package Contents:
2 x USB 2.0 9Pin male to Motherboard USB 3.0 20pin Housing Female cable 10cm.