Features: brand new and high quality 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 offers superior performance and unmatched data transfer rates, which is also an for ideal solution for the industrial automation applications. Speed: Single-Lane(x1) PCI-Express with throughput up to 2.5Gbps. 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 Serial ports Applicable slot: mini PCI-E Bus bandwidth: about 2.5Gb/s Product size: approx 120x80x67mm/ 4.72x 3.15x 2.64 in Serial Port(RS-232) Interface. Chipset: Wch CH382L 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.