It does its job exactly as you expect.. the only thing I couldn't manage to do is send the sound from one to the other... but again, I can't swear that I did it correctly...
Nevertheless.. an important note for future buyers...
The blue communication light... it lights up as soon as it receives a signal from the source... even if you have everything connected, if it doesn't receive a signal, it will never light up... and I thought they were broken...