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It's pretty easy to program voice recognition in controlled conditions.  When a person is yelling across the room and there are echos and noise from a TV, it can be very difficult.  

It's also critical to not respond to the word HELP except in the right context.  How do we keep the TV from triggering it?  How do we keep normal conversation from triggering it?

Even if a senior has a cell phone, and even if PERS devices are located any many convenient locations, they may be unreachable when someone falls.  It is common to fall in a location where the person can't maneuver or can't move.  You can't count on being able to reach anything.

I'm optimistic there is a solution, but it will be hard to make it work in the real environment and be accepted by the seniors.