Add an RS232 serial port with COM retention to your laptop or desktop computer through USB The FTDI chipset is highly customizable & compatible, making it the ideal solution for any setup Portable USB (Universal Serial Bus)-Powered design requires no bulky power adapter or outlet Simple installation & operation with COM port retention provides robust serial connectivity for legacy devices The ICUSB2321F 1-Port USB (Universal Serial Bus) to Serial RS232 Adapter Cable with FTDI chipset & COM Retention converts an available USB (Universal Serial Bus) 1.1 or 2.0 port into an RS232 serial DB9 port to connect, monitor & control your serial devices. This compact adapter features COM retention, allowing the same COM port value to automatically be re-assigned to the port if the cable is disconnected & re-connected to the host computer, or if the system is rebooted. The ICUSB2321F uses the FTDI chipset which supports additional customization, advanced features, & compatibility not necessarily offered by other solutions. Compatibility with a broad list of Operating Systems including Windows®, Windows CE, Mac OS & Linux, makes this product easy to integrate into mixed environments. Backed by a Star Tech.com 2-year warranty & free lifetime technical support. What’s in the box USB (Universal Serial Bus) to RS-232 Serial Adapter Driver CD Instruction Manual