... support two way talking GSM freq:GSM 850/900/1800/1900 MHZ real time vehicle tracking, online car tracker, tracking vehicleName: ... .Works worldwide Support 4-frequency GSM 850/900/1800/1900 MHZ.(Optional)High sensitivity, New technology and latest GPS SiRF- ... Sensitivity-158DbGPS FrequencyL1, 1575.42 MHzC/A Code1.023 MHz chip rateChannels20 channel all-in-view trackingPosition Accuracy10 meters, ...