Sunix 1-port RS-232 Serial PCI Express with both Regular Height and Low-Profile Brackets (SER6427A+L) Expands one independent RS-232 serial port with communication speeds up to 115.2Kbps With high reliable SUNIX SUN2212 native PCI Express 16C950 UART controller Designed to meet PCI Express Base Specification Revision 2.0 Supports x1, x2, x4, x8, x16 (lane) PCI Express Bus connector keys Built-in  15KV ESD protection for all serial signals meets IEC1000-4-2 standard Support Microsoft Windows, Linux, and DOS.