Adds eight industrial RS-232 serial ports by connecting to a USB port High speed serial port with the baud rate up to 921.6K bps RS-232 data signals: TxD, RxD, RTS, CTS, DSR, DTR, DCD, RI, GND Self-powered. One switching power adapter of 12V, 1A provided. OS Compatibility: Windows 7, 8, 10, & Windows 11 as well as Linux and Mac OS 10.X