The system is composed by a transponder with RFID technology, by a lector for open the door and by a antennas for the triangulation. The transponder is a key, with RFID passive signal you can open the door, so I'm sure that users will bring with their the transponder. The function of the button on the trasponder is turn on or turn off the RFID active signal for the triangulation. The RFID active signal will be used for localize the people in the building in case of danger because the signal can be triangulated. The triangulation requires three or more antennas. Also is possible use the transponder with a App for smartphone for navigate in the building.

The name of the project is Astro since this system is the good star who can localize the people in danger and enables with use of an App to know your location.