Product description ChenYang Motherboard 19/20Pin 2 to 4 USB 3.0 Chassis Back Panel Cable 0.5M with 12cm PCI-E Slot Bracket 19/20Pin Motherboard Header 2 to 4 USB 3.0 Port Multiplication Panel Cable. With 12cm length standard PCI-E bracket. Compliant with USB 3.0 Super-Speed (5Gbps), USB 2.0 Hi-Speed (480Mbps), USB 1.1 Low-Speed ( 1.5M bps). Through the 2 19/20-pin socket of the motherboard, you can get 4 USB 3.0 sockets. The extended USB 3.0 port can be used for keyboard, mouse, U disk, mobile hard disk, printer, etc.