Features:1. It is easy to allow more serial and parallel devices to be connected to your computer.2. Two 9-pin RS-232 DB9 external serial ports and one DB 25 external parallel LPT port.3. Complies with PCI Express Specification Revision 1.1.4. WCH382 master chip, stable and powerful.5. PCI Express single lane (x1) bus bandwidth 2.5 Gbps.6. Support for DOS, Windows 8 / 7 / Vista / XP / 2000 / Server 2003-2008 32/64 bit, Linux operating system.Specifications:Compliant with PCI-Express Specification Revision 1.1PCI-Express Single-Lane (x1) bus bandwidth 2.5GbpsSupport for DOS, Windows 8 / 7 / Vista / XP / 2000 / Server 2003-2008 32/64-bit, Linux and other operating systemsParallel interface (LPT)I/O address: assigned by BIOSIRQ: Assigned by BIOSSupport for SPP, PS2, EPP & ECP and modeSerial interface (RS232)Compliant with industry standard 16C450/16C550 UARTThe chip has a built-in 256-byte FIFO and on-chip H/W, S/W flow control function.The data transmission rate of each serial port can reach 250Kbps (customized data transmission can reach 1Mbps)Baud rate: 230.4KbpsSerial communication parameters Data bits: 5, 6, 7, 8Stop position: 1, 2Parity: None, Even, Odd, Space, MarkFlow control: RTS/CTS, XON/XOFFI/O address: assigned by BIOSIRQ: Assigned by BIOSSerial signal for RS-232: TxD, RxD, RTS, CTS, DTR, DSR, DCD, GNDPackage List:1 x Riser Card1 x Cover Board1 x Serial CableNote:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. 1It is easy to allow more serial and parallel devices to be connected to your computer. 2Two 9-pin RS-232 DB9 external serial ports and one DB 25 external parallel LPT port. 3Complies with PCI Express Specification Revision 1.1. 4WCH382 master chip, stable and powerful. 5PCI Express single lane (x1) bus bandwidth 2.5 Gbps.