This PCIe to serial adapter supports the following features: 4 PORT SERIAL CARD: Serial controller card w/16950 UART based on ASIX AX99100, allows 4x DB9 ports w/bi-directional RS232 speeds up to 921.6Kbps per port, available 256 byte FIFO buffer; Upgraded version of our popular card PEX4S952LP OPTIONAL CONFIGURABLE POWER: PCIe multiport serial card provides 12v, 5v, or none through pin 9 w/up to 2A total; Each of the 4 ports are individually configurable; DB44 to 4x DB9 breakout cable incl STANDARD PROFILE & LOW PROFILE BRACKET: PCI Express RS232 serial adapter card has low profile bracket pre-installed & 1x standard bracket incl for versatile install; Supports Windows XP and up & Linux VERSATILE APPLICATIONS: For low/standard profile desktop/servers w/ uses in point of sale terminals, PLCs, control/automation in factories, scientific sensors, medical equipment, scanner, oscilloscope.