• After the initial set-up, the central screen should have one big fat Sentinel button to be pressed and everything else miniaturized. This set-up would increase the scope of the pressing area in panic situations. All other things can be shown as small icons.
  • There is no need for instructions to appear all the time.
  • In addition to the text messages, Sentinel should be calling the three numbers continuously until at least one number picks up. An SOS feature some phones already have.

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