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 Card Material: PCB Chip: For ASIX AX99100 Bus Interface: PCIE X1 (Compatible with X1, X4, X8, X16) Expansion Interface: 2xRS 232. Package List: 1 x 2 Port PCI Express RS 232 DB9 Serial Port Card Note: 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.