As you will notice now in the Premiership etc the Officials are all mic’d up.  Ive clearly never used this system but think that this must be a great addition to the existing communication channels.  To be able to talk to one another without have to go across must be useful.
I came across this video today whilst looking on the Official Sports forum.
I liked the music in the clip but for some reason when they were first preparing the device for the game I was imagining the theme from Mission Impossible.