This USB 3.0 PCIe card lets you add four USB Type-A ports to your computer, through a PCI Express slot. With higher data throughput support, this PCI Express USB 3.0 card is a necessity for external hard drives, hard drive enclosures, and many other USB 3.0 peripherals. With four external USB-A ports you can connect more devices to your computer, such as flash drives and external drives. You can connect to both current and future high-bandwidth USB-A devices. The USB 3.0 card is backward compatible with older USB 2.0/1.1 devices that use a USB-A port.