Stable and reliable chipset.2 ports RS232 DB9 serial ports allow to connect more devices to your computer.Compliant with Single-Lane (x1) PCI-Express specification revision 1.0a.Standard RS-232 DB 9pin male serial port compliant.Supports 2.5Gbps PCI-E bus with full duplex channel.Supports up to 1Mbytes/sec transfer rate.Support RS-232 Hardware Flow Control.Supports PCI-E plug and play.Driver Supports Windows 9X / Me / 2000/ XP / Server 2003 / Vista / 7, Linux.Support devices: automated teller machine, bar-code reader, digital camera, digitizing tablet, external modem, finger print identification, infra-red transceiver, ISDN T/A, magnetic card reader, PDAs, POS devices, multi-modem dial-up server etc.Package Includes:1x Serial Port PCI-E Card1x CD DriverNote: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.