This Delock DVI switch is a manual bi-directional switch for connecting different devices with DVI port that offers two different applications. You can connect with DVI input two computers with DVI connection to a monitor, TV or projector, etc.. By pressing a button, the device can select which one to use for playback on the screen.You can connect a computer with DVI connection to two screens and selectable via a button on which screen the signal to be displayed. (A simultaneous output on multiple screens is not possible).