Welcome to our shop! 1、High-Speed Transmission: This PCIe RS232 serial adapter card supports serial transmission rates of up to 250Kbps, enabling fast data transfer and improving work efficiency. 2、2 RS232 Serial Ports: This PCIe to dual serial card features 2 RS232 serial ports, allowing you to connect multiple serial devices simultaneously to meet the needs of multiple devices working at the same time. 3、Supported Systems: This PCI Express RS232 serial adapter card is suitable for Win, for Linux, for DOS, and other operating systems, meeting the requirements of various users. 4、Wide Application: This PCIe RS232 serial host controller card is suitable for connecting various serial devices, such as printers, barcode scanners, CNC machine tools, etc. 5、Easy Installation: This PCIe to RS232 expansion card uses a PCI Express x1 interface and can be used in PCIE slots of various lengths (x1, x4, x8, and x16). Item Type: PCIe RS232 Serial Adapter Card Material: Printed Circuit Board Transmission Type: PCI Ex1 to 2 RS232 Serial Transmission Rate: 250Kbps Operating System: Suitable for Win, for Linux, for DOS 1 x PCIe RS232 Serial Adapter Card Satisfaction Guaranteed: 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.