Since May 2005 the midi radio transmission is available. The data converter from analog to midi data is a self development. The radio raduis is 30m in buildings and about 100m outside. The whole system can be stroed at the back of your suit. . 

Radio set up - Akku, Midi-Interface and Sender

Here the wolds first and only Trigger to Midi Interface in this size 

The Trigger to Midi Interface enables you to transfer 11 trigger signals in parallell!