DVS4P 1x4 DVI Video Splitter allows you to use a single PC to display identical images on multiple monitors. Automatic EDID learning fo the support of any DVI monitor. The function to display identical images on more monitors, is an attachment of another splitter. Connect the DVI male/female extension cable between the former splitter of the "DVI out 1" port and the latter splitter of the "video in" port for cascading.