Vehicle gps tracker with listening function

SiRF III GPS
Quad GSM(850/900/1800/1900MHz)
Real Track(SMS/GPRS/TCP/UDP)
Communication Protocol:MapTrack
SMS Reply Detail Addr/ Auto Track by Time | distance
GPS Data Restore / Mileage calculate
Internal Battery
SOS Alarm / G-Fence / OverSpeed
Low Battery / OverSpeed/ Towing / Parking Alarm
Power Off / Anti-Steal / ACC Alarm
Remote Fuel Control
Remote Listen in
Inquiry SIM balance
Compatible existing car alarm
Vehicle gps tracker with listening function