The USB to RS-232 Converter is a self powered usb to DB9 serial port adapter.
Most new laptops and PCs no longer come with a RS-232 serial interface, which poses a problem for the large number of users who need to have serial communications for their projects. This adapter quickly converts a USB port to a full RS-232 port.
Just install the driver (included on mini CDR, but not necessary for most latest operating systems like WinXP/Linux/OSX), plug the adapter into an available USB port and then connect your regular serial cable. Instant serial port!