... products based on existing GSM/GPRS/CDMA+GPS satellite,the product could locate and monitor ... GPRS. It has the functions as following : SOS alarm,stop engine remotely,ACC detecting,static milleages ... Area l Vehicle rental / Fleet management etcl GPS tracking,query the position of vehicles,real time ... 5.Product function instructions WT-TK109 Gps Tracker For People GpsTracker with Monitoring and SOS