Istartek PT21 GPS animal tracker has a "Panic button" for emergency functions, the "Panic button" function active a call with one lists of phone numbers. You can control the hours of service of Istartek PT21 GPS animal tracker in real-time by 3 modes: (sending SMS messages, with a smartphone app or from a Tracking Management Platform always online). Istartek PT21 GPS animal tracker can send the following SMS alerts to a mobile phone with scheduled reports of: (geofence, panic button, low battery) every time that detect one of these events. Istartek PT21 it is also a GPS tracker with voice call, support two-way calls, remote listening and SOS call. The precise fix of Istartek PT21 GPS animal tracker can change depending if PT21 is in outdoor scenario (5-15 meters) or in indoor scenario (10-50 meters), the fix position in indoor scenario is through Wi-Fi signal.