Features: 1.Allows to connect more serial & parallel device to your computer easily. 2.Two (2) 9?pin RS?232 DB9 male serial ports and one DB 25 female parallel LPT port available. 3.Compliant with PCI Express Revision 1.1. 4.PCI Express single?lane (x1) bus bandwidth 2.5 Gbps. 5.Support for DOS, for Windows 8 / 7 / Vista / XP / 2000 / Server 2003?2008 32/64?bit, for Linux operating systems. specification: Allows to connect more serial & parallel device to your computer easily. Two (2) 9-pin RS-232 DB9 male serial ports and one DB 25 female parallel LPT port available. Compliant with PCI Express Revision 1.1. PCI Express single-lane (x1) bus bandwidth 2.5 Gbps. Support for DOS, for Windows 8 / 7 / Vista / XP / 2000 / Server 2003-2008 32/64-bit, for Linux operating systems. Parallel interface (LPT): I/O address: Assigned by the BIOS IRQ: Distributed by the BIOS Support SPP, PS2, EPP & ECP mode Serial Interface (RS232): Comply with industrial standard 16C450/16C550 UART On-Chip 256-bit depth FIFOs in Transmit, support H/W, S/W flow control Data transmission rate of each serial port can be up to 250Kbps Baud rate: 230.4 Kbps Serial communication parameter data bits: 5, 6, 7, 8 Stop bit: 1, 2 Parity: None, Even, Odd, Space, Mark Flow control: RTS/CTS, XON/XOFF I/O address: Assigned by the BIOS IRQ: Distributed by the BIOS Serial signal RS - 232: TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND s: Chip: WCH382L Type: PCI-E to Serial + Parallel Interface Card Interface: 1 x PCI-E, 2 x Serial, 1 x Parallel Operating Systems: Support for DOS, for Windows 8 / 7 / Vista / XP / 2000 / Server 2003-2008 32/64-bit, for Linux operating systems. Package weight: 125g Package Included: 1x PCI-E to Dual Serial Port + Parallel Port Controller Card 1 x Drive CD Note: 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.