🚀 go-pugleaf

A friend of mine works in a large warehouse which stores thousands
of boxes for long periods of time (between 1 and 5 years).
The firm sometimes misplaces boxes and has to replace the contents -

He asked me to look into the idea of "tagging" each group of boxes
with devices which could be triggered to beep if needed.
(if a box wasn't on the expected shelf you could "page" it and the
beep would help you find it among all the other boxes).  Direction
and range information isn't necessary because the signal is audible.

I thought of a "dumb" pager; no message capability, no vibrator.
Just a simple (loud) beeper in a durable and reusable case.
Have a low power transmitter (after all, it's _inside_ a metal
building - maximum transmit distance 500 meters) page missing boxes
and follow the beep.

Does anyone have pointers to such a system or clues on where to
steer someone interested in building same?

Response summary posted if sufficient interest.

Thanks in advance.

-dave
 dmackie@ucsd.edu
 70641.3141           Compu$erve