Features: 1.High Speed Transmission: The PCIe RS232 serial adapter card supports serial transmission rates of up to 250Kbps, enabling fast data transmission and improving work efficiency. 2.2 RS232 Serial Ports: This PCIe to dual serial card provides 2 RS232 serial ports, which can connect multiple serial devices at the same time to meet the needs of multiple devices working at the same time. 3.Supported System: This PCI Express RS232 serial adapter dard is suitable for Win, for Linux, for DOS and other operating systems, which can meet the requirements of different users. 4.Wide Application: This PCIe RS232 serial host controller card is suitable for the connection of various serial devices, such as printers, barcode scanners, CNC machine tools, etc. 5.Easy Installation: This PCIe to RS232 expansion card adopts PCI Express x1 interface and can be used in PCIE slots with different lengths(x1, x4, x8, and x16). specification:Item Type: PCIe RS232 Serial Adapter Card Material: Printed Circuit Board Transfer type: PCI Ex1 to 2 RS232 Serial transmission rate: 250Kbps Operating system: Suitable for Win, for Linux, for DOS PackageList:1 x PCIeRS232SerialAdapterCard