Features: PCI Express x1 bus slot for installation on a variety of PCI Express slots Including 4x, 8x, and 16x) Support a variety of mainstream operating systems, including Windows, MAC- and Linux. 8 RS-232 serial ports support up to 230.4Kbps communication speed and provide modem control signals to ensure compatibility with a variety of peripheral serial devices. Support for DOS, Windows 8, Windows 7 / Vista / XP / 2000 / Server 2003-2008 32/64-bit, Linux & Mac OS / X 10.5 and other operating systems Supports up to 8 RS232 serial ports.Each serial port has a built-in FIFO 100% brand new and high quality PCI-Express expands 8-port RS232 serial ports and is designed for POS and ATM applications and is the preferred choice for industrial automation system integrators. Package Includes: 1 x PCI-Express I/O 8-port Serial Card 1 x Fan-Out Cable 1 x User Manual Specifications: Compliant with PCI-Express Specification Revision 1.1 PCI-Express Single-Lane (x1) bus bandwidth 2.5Gbps Support serial port number change, Card Size:approx:93mm (L) x 65mm /3.66x2.56in Baffle Length: 12cm/4.72in Serial Port (RS232) interface Supports 8 RS232 Serial ports on 1 Fan-out cables TVS on each signal of RS232 port - for the protection of 200W Voltage Surge and +/-20kV ESD On chip 256-byte depth FIFO in transmit, receive path of each port Transfer data rates up to 921.6Kbps on each port Supports hardware and software flow control Supports 5-, 6-, 7-, 8- bit serial format Supports even, odd, none, space & mark parity Supports 1, 1.5 or 2 Stop bit operation note: With CD Driver. 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!