It is a tiny device that takes input from a single source and delivers it to multiple displays simultaneously. It has a single HDMI input port and multiple HDMI output ports.

Professor Hawking used an input device controlled by his cheek movements to choose the words he wanted to use. A special output device turned those words into electronic speech that people could hear.

In practice, it's a thrice-weekly Sisyphean gauntlet for my audio configuration, during which I'll frequently discover that Windows has lost track of what input and output devices are plugged into ...

It is a tiny device that takes input from a single source and delivers it to multiple displays simultaneously. It has a single HDMI input port and multiple HDMI output ports.