The VGA-AB4 is 4 way VGA monitor switch box that allows you to share a single VGA monitor or TV with four different computers or digital video recorders (DVRs).  This device is very convenient in situations where you have a multiple computers that need to share one monitor or when you have multiple computers located close to where your surveillance DVR will be located and you do not want to add an additional monitor or you do not have room to do so.  Simply plug up to 4 devices into the 4 way VGA splitter and select which one you want to appear on the shared monitor.  This switch box is limited to a max resolution of 1024 x 768.