Features: Support PCIE for RS232 9Pin serial devices offering broad compatibility and easy installation. High-speed transmission rate, ensures the stability and accuracy of data transmission; Strong compatibility, applicable to a variety of operating and software platforms. PCIE to 2 standard RS232 serial port DB9pin interfaces expansion with 2 line, more convenient connection Support: industrial control machine, communication; LED control, POS machine and other 9-pin serial port general-purpose equipment. Specifications: Item:PCIE To RS232 Serial Port Card Adapter Cable Length:about 20cm/7.87in Speed: 1MBytes. Chip：AX99100 Slot：PCIE Compatible X4X8X16 Port： 2port Package Includes: 1PC PCIE to 2 Port RS232 Expansion Card note: Due to problem of lighting,there might be tolerances in product, please understand. Please allow 0-1cm error due to the measurement