​Description:Because now more and more USB devices, USB port on the chassis is not enough time! You can use this device directly put 19PIN interfaces, 9PIN interface and audio on the board turn into a 2 USB2.0 + 2 USB3.0 interface output,optical drive installed in the idle position. This provides front facing USB interfaceFeature:Plug & play, no external power needed.Backwards-compatible with USB 1.1 and USB 2.0.Interface: PCI-E 1X Interface, 4 Ports USB 3.0 InterfaceMaximum Speed: 4.8Gbps(SuperSpeed) which is 10 times faster than USB 2.0(480Mbit/s).Compatible system: WinXP / 2003 / VISTA / 2008 / Windows 7 / Windows 8  /  Windows 10/ MACNote: this panel is the PCI-E interface, directly inserted into the motherboard PCI-E slot, do not connect the USB interface.must connect the Large 4PIN to the computer's Large 4PIN interfaceHardware requirements:A motherboard with a PCI-E interface ,With idle optical drive chassis.Package included:1 x 4 Ports USB 3.0 5.25" Front Panel Expansion Bay4 x Screws1 x PCI-E Card AdapterNO Retail Box. Packed Safely in Bubble Bag.