The ICUSB2324X 4 Port Professional Grade USB Serial Adapter converts a single USB port to four RS232 serial ports allowing you to connect to, monitor and control your serial devices. Rugged metal construction and sturdy wall-mount brackets provide a robust solution for both harsh industrial environments and simple desktop installations. Powered by USB, the device does not require a power outlet for most standard applications. For installations requiring power through the RS232 ports, optional DC connector and terminal block connections are included. Once connected, the adapter retains assigned serial COM port values, allowing the same values to automatically be re-assigned to the ports provided by the adapter in the event it is disconnected, then re-connected to the host computer. This innovative Serial adapter offers a professional grade solution for connecting legacy or industrial RS232 serial devices to more modern computers, or computers with unused USB ports - perfect for connecting serial modems, barcode scanners or any device with serial sync through USB, eliminating the expense of upgrading serial peripherals for USB compatibility. Having trouble viewing the video? To view the file in an alternate format (.wmv), click on the following link, or download a copy to your desktop by right-clicking the link and selecting "Save Target As": 4 Port Wall Mountable USB to Serial Adapter Hub with COM Retention (.wmv) Backed by a StarTech.com 2-year warranty and free lifetime technical support.