2 x DSUB 9, serial ports, male, UART 16C950 Chipset: MCS9901 Data transfer rate up to 230, 400 bps Compliant with PCI Express base specification 1.1 Compliant with PCI power management 1.2 Operating temperature: 0 °C - 70 °C Operating humidity: 25% - 65% RH (non-condensing) Supports Windows 10, 8.1, 8, 7, Vista, XP, Mac OS X and Linux l+ 2x low profile