This BNC switch by Delock is a manually bidirectional switch for connecting different devices with BNC port. This switch offers two different applications. You can connect two computers with BNC port to one monitor, TV with BNC input port. By usingThe button you can select which device should displayThe signal. You can connect one device with BNC port to two displays and selectThe monitor which should displayThe signal by usingThe button. (Simultaneous output to multiple screens is not possible)