The Belkin F5U109 F5U409 USB to 9 pin RS-232 DB9 Serial Portable Adapter is a convenient and compact AC/AC adapter that allows you to easily connect a USB device to a PC with a RS-232 DB9 port. This adapter, featuring a USB connector A, provides a reliable interface for communication between the two devices. With its compatibility with PC models and user-friendly design, this portable adapter from Belkin is a practical solution for connecting serial devices.