This application helps you so that when your car is parked, even if you block someone or not, but they are in a critical moment (accident, blockage, etc.) you can be contacted quickly without having to leave your phone number in window.
Moreover, the notification you will receive from the person who wants to warn you that your car is in danger will not bother you more than necessary.

All you have to do is install the application, register your vehicle and put a note on the windshield so that others know that they can notify you through this application.