Car track_GPS locator,voice monitoring,Cut off the car engine when in urgency,accurate locate,detect ACC,SOS button, Car track_GPS ... 1900Mhz or GSM 850/900/1800/1900Mhz (optional)GPS Chipsetlatest GPS SIRF-Star III chipsetGPS Sensitivity-158DbGPS FrequencyL1, 1575 ... RMSVelocity Accuracy0.1 m/sTime Accuracy1 us synchronized to GPS timeDefault datumWGS-84Reacquisition0.1 sec., averageHot start1 sec., ...