All-in-one expansion set includes PCI-E USB 3.0 card and 5.25 -inch front panel metal bracket with 4 USB 3.0 ports; PCI Express x1 interface fits all mainstream motherboards, delivers steady 5Gbps high-speed USB 3.0 transmission; Standard 5.25 -inch CD-ROM bay mounting design moves all USB ports to case front for easy plug/unplug; Great for old PCs lacking built-in front USB headers, supports external HDD, flash drives, mouse, keyboard and gaming peripherals; Plug-and-play design, compatible with mainstream Windows operating systems, no complicated driver setup