Work for 5.25' CD-ROM Bay Compliant with USB Base Specification 3.0 ; Compliant with USB 3.0 Super-Speed (5Gbps), USB 2.0 Hi-Speed (480Mbps), USB 1.1 Low-Speed (1.5Mbps) Max. 900mA per port , Build-in GL3520 Chipset USB3.0 interface and 5.5inch bay of PC front panel. USB 3.0 HUB 4 Ports Front Panel to Motherboard 20Pin Connector Cable