Coolgear 4-port USB to RS232 Adapter FTDI FT4232H & ZyWyn Provides 4 RS232 Serial Ports over USB 2.0 Port USB 2.0 High Speed (480Mbits/Second) and Full Speed (12Mbits/Second) compatible Supports Wall Mounting Kit and Optional DIN RAIL Clips Powered by USB Bus Power, no external power supply needed. OS Compatibility: Windows XP, 2000, 2003, CE, Vista, Windows 7, 8, and 10, as well as Linux and Mac OS 10.X