brand new and high quality Features: Allows to connect more serial devices to your computer easily. Stable and reliable chipset AX99100 with signal enhancement chip. Standard RS-232 DB9 male serial port compliant. Compliant with Single-Lane (x1) PCI-Express specification revision 1.0a. Supports 2.5Gbps PCI-E bus with full duplex channel. 2 external RS-232 DB9 male serial ports available. Specification: Model: TXB100-2S Chipset: ASIX/AX99100b Port Number: 2 Serial Port Interface: PCI for Express 1X slot Support OS: Windows10, 8 , 7 , Vista, XP, 2000,Linux, DOS, for Windows Server 2003 Material: PCB Baffle Size: approx.120mm/4.72in Color: As pictures shown Quantity: 1 Pc Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1 x PCIE Expansion Card