Features: The PCI-Express I/O card uses the latest PCI-Express interface as the expansion bus, the standard interface of which the most common PC desktop system in the market is widely used. Expand the system with 2 additional serial ports for connecting their external peripheral devices. This PCI-Express I/O card offer superior performance and unmatched data transfer rates, which is also an good solution for the industrial automation applications. Full serial port bidirectional speed up to 25mbps each port, support remote wake-up and power management functions. Supports for Windows 10/ 98/ME/ 2000/ xp/ Vista for Windows bit, and linux. Specifications: Product name: Pci-E to RS232 Serial Port Card Number of interfaces: 2 RS232 DB9pin Serial ports Applicable slot:PCI-E Product size: approx 120x80mm/4.72x 3.15in Serial Port(RS-232) Interface. Chipset: AX99100 Chip Package Includes: 1PC x PCIe Card note: The colors deviation might differ due to different monitor settings, please kindly understand. There might be little error of size for manual measurement.