Add two RS232 serial ports with COM retention to your laptop or desktop computer through USB. The ICUSB2322F 2-Port USB to Serial RS232 Adapter Cable with FTDI chipset and COM Retention converts an available USB 1.1 or 2.0 port into 2 RS232 serial DB9 ports to connect, monitor and control your serial devices. This compact adapter features COM retention, allowing the same COM port values to automatically be re-assigned to the port if the cable is disconnected and re-connected to the host computer, or if the system is rebooted. Unlike most USB-serial adapters, this one uses the FTDI chipset, which supports additional customization, advanced features, and compatibility not necessarily offered by other solutions. This USB-serial adapter is compatible with a broad list of Operating Systems, including Windows, Windows CE, Mac OS and Linux, making this product the perfect solution for integrating into mixed environments.