John Williamson:
Thans for the more detailed explanation.
I know for a fact our district uses this
service:
http://www.myinstoreradio.com
You can see the receiver itself in the
upper-left-hand corner of the home
page. We have one like it on top of
the amp that mixes telephony and the
music from the receiver.
If you browse the site you'll
probably pick up that it is aimed
squarely at retail clients/management,
as there is ZERO technical jargon
or explanation as to how the system
actually works.
Research on line has revealed
nothing concerning the make, model,
or mfg of that little black box.