I work for a school district as tech support. We installed LCD projectors in the ceilings in a few of the classrooms and needed to have the video from the computer project onto the screen while also showing on the monitor. We had some "Y" video splitter cables, but they did not work at all. So I purchased these Aten 2 port 250MHz VGA splitters and they work great! Very easy to install and set up, the picture is perfect, and everyone's happy. The price was right also.