Add one 9-pin RS-232 serial port to USB-equipped Windows computers Converts one USB Type-A port into one 9-Pin RS-232 serial port on a Windows desktop or notebook computer Supports USB 1.1 specifications with serial port data transfer rates up to 230Kbps Features built-in 512 byte FIFO buffers, 15KV DC ESD serial interface protection with software flow control Works flawlessly with RS-232 serial devices such as modems, ISDN terminal adapters, PDAs, bar code scanners, label printers, and many more Plug-and-play and powered by the USB bus, no external power adapter is needed