All the TV's in the bar are labelled with a number, and there is a corresponding button for each on the box. You press which ever one you want, turn up the volume, and just like that you can hear the audio for whatever you are watching. Every table in the restaurant was equipped with one of the boxes.
Come football season I imagine these things are going to be huge on Sundays. It's a pretty ingenious idea for sports bars, to tell you the truth I can't believe it hasn't already been around for years.