Feature:1. 2 SERIAL PORTS: PCIE RS232 allows users to add two RS232 BD9 serial ports to desktop computers or industrial equipment through the PCI Express slot on the motherboard.2. PCIE X1 INTERFACE: The full size bracket on this expansion card is suitable for standard size PCs, based on PCIE X1 interface, and can work in X1, X4, X8, X16 slots.3. SUPPORT OS: Requires driver installation on for Windows XP, for Vista, 7, 8.x, 10, 11 (32/64 bit) systems. for Linux kernel 2.6.x, 3.x, 4.x, 5.x requires reference to compiled source code.4. SUPPORTS 256 BYTE DEPTH: The PCIe serial expansion card selects the for ASIX AX99100 program, which supports on chip 256 byte depth FIFO transfers. Suitable for for Intel, for ARM hardware platforms.5. APPLICATIONS: PCIE serial DB9 port card seamlessly connects POS systems, industrial measurement and control devices, security systems, logistics management devices, scanners, printers and other serial DB9 port devices.Specification:Item Type: 2 Port PCI Express RS 232 DB9 Serial Port CardMaterial: PCBChip: For ASIX AX99100 Bus Interface: PCIE X1 (Compatible with X1, X4, X8, X16)Expansion Interface: 2xRS 232.Package List:1 x2 Port PCI Express RS 232 DB9 Serial Port CardNote:1. It is important to ensure that the user's PC has an available PCIE slot.2. Please install the correct driver from the Mini CD of your desktop PC.