Features: 2-port PCI express serial card turns a PCI-E expansion slot into 2 RS-232 DB9 serial port for your computer to connect multiple legacy serial devices Dual serial port card supports IRQ sharing and operates flawlessly with Windows 10, 8, 7, Vista, XP, 2000, ME, 98, Mac OS, Linux, etc; PCI-E 1.0 a specification, Standard 16C550 UART signal PCI express combo card bracket with two RS232 serial interface uses WCH382 chip, high speed data communication transfer rate up to 250 Kbps Standard-height PCIe card bracket design allows the PCI to serial card to be installed in virtually any desktop computer case (full profile computer chassis) An ideal serial expansion PCIe card adapter for fax modem, GSM modem, printer, barcode reader, cellular phone, PDA, POS machine, GPS, ISDN terminal adapter, satellite receiver, digital camera, hard drive, radio system, etc (If need driver installation guide , pls contact us directly via the order page.) To get the PCI-E multiport serial controller card with WCH chip installed in a PCI slot, it will enable you to add dual serial ports to your PC system, and reducing the load applied to the CPU by as much as 48% over conventional serial cards, so you can get mutilple legacy RS-232 devices to work in various task again. The PCIe card adapter comes with standard-height bracket design that allows the PCIe serial card to be installed in virtually any desktop computer case (both standard profile and full profile computer chassis). The 2 port RS232 serial PCI express adapter supports Windows 10, 8, 7, Vista, XP, 2000, ME, 98,etc; Ideal for extenal fax modem, GSM modem, serial printer, barcode reader, cellular phone, PDA, POS machine, GPS, ISDN terminal adapter, satellite receiver, digital camera, radio system, etc Fit for various PCI-E slots like PCI-E x1, PCI-E x2, PCI-E x4, PCI-E x8, PCI-E x16, etc. Packing Included 1x 2 Port PCIe Serial Card 1x 120mm Standard Height PCI-E Bracket 1x CD Driver (Adapter's chip number:.CH38X . If can't use CD to install the driver, pls search CH38X and download the driver on the WCH-IC website (CH38XDRV.EXE)