Sounds similar to a couple wireless training system I have seen on some German web-sites:
http://www.jamara.de/testberichte/wi...wireless-1.jpg
http://www.acteurope.de/html/t3s-system.html
I saw an english website with a similar product (wireless trainer) once, but I don't have a link to it. I can think of a few pilots who would be interested in adding that type of system to their already highly redundant systems.