Iseebiz4 Port 250mhz 1920x1440 Pc VGA Video Signal Monitor Splitter Booster Extender Amplifier video splitter can be from any source (such as a computer) copy of the video signal output to four display devices (monitors and projectors,etc.). In addition to copying the signal output,but they can also enhance the signal to provide a connection of up to 30M distance. Users can also use multiple monitors stacked in series (up to three)to expand the number of devices supported by the display. This product can use pc/dvr/laptop vga interface output to the lcd/tv/vga interface equipment such as projector, plug and play, easy to use!