This is a bidirectional HDMI switch and can be configured as following (thus bidirectional).
Configuration one: one source to two monitors. When the ONE port side is HDMI signal source, such as a computer or a camera, its output will be displayed to a monitor connected to either one of the port on the other side (but not bot simultaneously)
Configuration two: one monitor to two computers. When the ONE port side is connected to a monitor, it will display signal source connected to either one of the port on the TWO port side. For example, a monitor can be connected to the ONE port side, a computer can be connected to one port on the TWO port side, and a camera can be connected to the other port on the TWO port side.