The Belkin F5U109/F5U409 USB to 9 pin RS-232 DB9 Serial Converter Adapter allows for easy connectivity between a PC or Mac and various devices that use a 9-pin RS-232 DB9 serial connection. This converter, manufactured by Belkin, ensures reliable operation and compatibility with the specified model, F5U409. With its USB connector, this adapter provides a convenient solution for connecting serial devices to modern computing systems. Made in China, this unit is designed to meet the needs of users looking to expand their computer's connectivity options.