The Zonet ZUH2215V 4 +1 Ports USB 2.0 PCI Host Controller is a USB expansion card designed to add more ports to a computer's system. With a single USB 2.0 port, this PCI card from Zonet allows for easy connectivity of various devices such as printers, scanners, and external hard drives. The ZUH2215V 4 model is compatible with PCI ports and provides a convenient solution for expanding the computer's interface capabilities.