Has anybody heard of personal alarm monitors, and know where to get them,
if they exist?  I was at the doctor's office the other day, and while I was
waiting in the exam room for the doctor to come in, the alarms went off,
and I couldn't hear them at all.  Somebody came and got me, and we all went
outside for ten minutes or so.  That incident brought home to me just how
inadequate fire, smoke, CO2, backing, and any other similar alarms are for
the deaf or hard of hearing.  There are some monitors that you can wire or
plug into your circuitry at home, but that's useless anywhere else.  What I
envision is a battery-operated device somewhat analagous to a
voice-activated recorder:  A device that will react to loud sounds in the
frequencies used by most of the above listed alarms, by causing a vigorous
vibration of the unit, and which can be carried in a pocket, worn around
the neck or wrist, or clipped to the waistband, and which will function
anywhere, without having to be part of a set or plugged in.

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