Welcome to our store! 1. Strong Expandability: This PCIE serial expansion card can expand 1 PCIE x1 slot into 4 RS 232 serial ports through the PCIE slot, significantly increasing the number of serial ports on the computer and meeting the demand for serial ports for industrial control equipment. 2. High-Speed Transmission: The PCIe RS232 serial host controller card supports 2.5 Gbps bandwidth for PCI Express x1, ensuring fast and stable data transmission and effectively improving the response speed of industrial control equipment. 3. High Stability: The 4-port PCI Express RS232 serial adapter card is made of PCB material and undergoes a strict process to ensure product stability and reliability, making it suitable for various industrial control environments. 4. Wide Compatibility: The PCIe RS232 serial host controller card supports a variety of operating systems, including DOS, Windows, Linux, and OS X, etc. It can be widely used in various industrial control equipment and is compatible with existing systems. 5. Plug and Play: The PCIE serial expansion card does not require complicated installation or driver installation; it's plug and play, saving users time and effort. Item Type: TXB071 PCIE to 4-Port RS232 Serial Expansion Card Material: PCB Adapter Type: PCI Express x1 to 4xRS 232 PCI Express x1 Bandwidth: 2.5 Gbps RS 232 Communication Rate: 250 Kbps System Support: for DOS, for Windows 7/8/for Vista/XP/2000/Server 2003 to 2008 32/64 bit, for Linux, for OS X 10.5 and other operating systems 1 x TXB071 PCIE to 4-Port RS232 Serial Expansion Card Guaranteed Satisfaction: Customers are our top priority. If you find any problem with the product, please contact the seller immediately. We strive to provide satisfactory after-sales service.