2 By 1 (One Input Two Outputs) HDMI Splitter

An HDMI splitter is a device that takes the video and audio content from a single source and then duplicates, or “splits”, that signal into many, which enables the signal to be displayed on multiple sources. For example, an HDMI splitter can take the content from one satellite box and display that content on multiple TVs.
HDMI splitters are great space savers. Instead of equipping a second TV with its own satellite or cable box, you can just use an HDMI splitter in one area of your entertainment center, cutting down on the number of items you need for the other TV.
This particular one stands out because it allows supports 4k videos.