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These are cheap disposable audio beacons with foam tape backing
that run on the same batteries that they put in audio greeting cards.
The beacons could be made to last for a few hours. These could be
used for events where blind people are going to need assistance
navigating to and from the
event, for instance from the subway to a
meeting place and back when the path is not straightforward when
navigated by cane or dog alone.