Refinements for the Lifesaving Car Seat Idea

My husband and daughter had some good suggestions to add to the idea of a car seat with thermometer and cell phone built in:

--The seat should phone the parent(s) first, at a lower temperature, and if no one comes and extracts the child, then phone the EMT's.

--Since it may take some time for help to arrive, the car itself should somehow be part of the setup so that after the first call, the car windows could be rolled completely down. (This might be a feature one could turn off, depending on the neighborhood where the car will be left -- although the risk of kidnapping or other harm to the child from an accessible interior is probably far less than the risk of leaving the windows up.)