This HDMI switch by Delock is a manual bidirectional switch for connecting different devices with HDMI port. This switch offers two different applications.1. It can be connected two computers with HDMI port to one monitor, TV or projector etc. with HDMI input port. By usingThe button, it can be selected which device should displayThe signal.2. It can be connected one computer with HDMI port to two displays and selectedThe monitor which should displayThe signal by usingThe button. (Simultaneous output to multiple screens is not possible)