I got a Bluetooth pair of cordless headphones for
Christmas and really like the performance.  Just as advertised,
the range is about 30 feet and it simply goes dead suddenly when
you get in a null or go outside the range.

	One issue you may have is that at least with these
cordless headphones, it can "pair" with any suitable transmitter
in the area.  I don't know how many can coexist, but you must
train the headphones upon power-up by pressing the start button
on the transmitter, then the power button on the headphones,
themselves.  After holding it down for a couple of seconds, the
communications channel is established and you get audio.

	While you might get by with many pairs of transmitters
and receivers, I don't think you can have, say, 10 headsets
listening to Channel 1, 4 listening to Channel 2, etc.  At least
with this pair of headphones, it only comes to life after
establishing a link with a specific transmitter that you had in
setup mode.

	Both the transmitter and headset have status LED's that
blink slowly when they are on but not connected to a transmitter.
They blink differently when training and when actually working so
I don't know if the transmitters can establish multiple streams
like you get with multicasting over TCP/IP.

	My suggestion is to find some way to try it before you
buy it.  If it works as you need it to, Bluetooth is a good
possibility.

	The only other thing I have noticed that might not be a
factor, is that there is enough buffering involved to give about
a 1/4-second audio delay as you listen.  You notice it if you
flip a switch or do anything that changes the audio suddenly.
You would certainly hear the delay if you could hear the source
via some other means at the same time you heard it through the
headset so that is another consideration.

	This particular headset came from Sharper Image and will
run about 2.5 hours before you must recharge the LI battery which
is not user-removable, (my only real criticism).


Martin McCormick WB5AGZ  Stillwater, OK 
Systems Engineer
OSU Information Technology Department Network Operations Group
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