Use UTP cable to extend VGA & Audio signal; Provide a VGA interface on the sender part for local use; Use single CAT5/CAT5E/CAT6 cable to extend signal, save cost; Software free, pure hardware design, support Plug & Play; video & audio signal transmission are Real-time, no time delay; small volume, easy to install. Support MS-DOS, Windows, Linux, Unix, Novell ; Support cascade operation;