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This dual-port PCI Express RS-232 DB9 serial port card adopts PCIE 2X interface design, providing two independent DB9 serial ports to expand connectivity for serial peripheral devices. It is fully compatible with Windows XP, Vista, 7, 8, 10, 11 (32/64-bit) and Linux operating systems, plug-and-play with strong system adaptability. The card features optimized PCB circuit and anti-interference design, ensuring stable and reliable RS-232 data transmission. Perfectly suitable for industrial control equipment, POS terminals, barcode scanners, serial communication devices and desktop PC serial port expansion needs. Compact standard bracket design fits most desktop chassis for effortless installation.