SIIG's 2-Port USB to RS-232 Serial Adapter Cable is designed to add 2 RS232 serial ports to your USB-enabled desktop or notebook computer. It supports serial port data transfer rates of up to 230Kb/s supports USB plug and play and is powered by the USB bus no external power adapter is needed. It is the perfect solution for connecting additional RS232 serial devices such as modems digital cameras ISDN terminal adapters graphics tablets PDAs bar code scanners label printers and more.