... GSM/GPRS network and GPS satellite positioning system, which set multiple functions of security, positioning, monitoring surveillance, emergency alarms and tracking ... 4: Support GPRS on-line and GPRS re-connected automatically if GPRS drops.5: Compatible with ... device to monitor the voice. 5: Alarms:Low power alarm, Power off alarm, Shock Sensor alarm, SOS ... Shock Shake Real Time GSM/GPRS/GPS Car Vehicle ...