You can manage different SMS alerts and the TOPFLYTECH TT8503 GPS tracker send to a predefined phone number all notifications. TT8503 of TOPFLYTECH also has a Panic button key, each time that the person can click the button you can receive a notification in your mobile phone. This GPS Tracker with Microphone / Speaker allowing to make SOS calls or release two-way audio around to the device in any moment. If you don’t like that an unauthorized person used the TT8503 device of TOPFLYTECH, you can have configured then to can read an authorized RFID tag.