This application acts as a speed dialer. It is setup with an easily recognizable icon so that a younger person / or possibly incapacitated person could easily call an emergency contact number with the press of a button.
Perfect for households without a traditional land based telephone line and young children. In case of emergency a younger person could easily call for help by pressing the red phone button - parents can preset which number is auto-dialed.
As the father of 3 young daughters I felt this application is useful since explaining how to dial 911 to a 3 year on the iPhone can be a little tricky.