I have been working on device based on the BC127 bluetooth module. The idea is to and from stream audio over bluetooth to this receiver. The user wears this pack a bit like an IEM… in fact the idea is to use it with IEM style earphones. The transmitter connects to a unit that combines coms traffic from hardwired coms loop and radio, and has an input for a program mix. The transmitter is proving more difficult. The beltpack works for the moment… It is has a lithium poly battery, USB to charge it, a couple of buttons to engage microphone on radio or hardwire, and global volume. The mix between channels is made at the as yet unstarted base station.