Superior Mini SPY Vehicle GSM GPRS GPS Tracker or Car Vehicle TrackingLocator Device Simply insert a GSM sim card into the GPS unit. Whenever you call the unit it will respond with the coordinates of its location throught a SMS message. You can then use these coordinates on any mapping software (for example Google Earth) which will show where exactly the unit is located.(only support 2G network) This Cutting-Edge GPS tracker is designed for advanced tracking/monitoring, especially for vehicle tracking using GPS, GSM and GPRS technology. The GPS tracker is designed for use in any vehicle to track it's location, such as cars, trucks, boats, motor homes, vans and construction machinery and many more - the live tracking possibilities are limitless! This is particularly useful if your vehicle, pets, child or your belongings have been stolen. Time to enjoy the benefits this GPS tracker brings! Note: in advanceUsing mobile phone send SMS commandsto device and set online platform Pls insert the 2G of GSM sim card and compatible 2G of GSM network , open the gprs function and ask APN name. Locate current position by GPRS/SMS