1.Build-in GPS personal locator. 2.GSM /SMS ... % Non-condensingGSM moduleGSM 900/1800/1900MhzGPS Chipsetlatest GPS (AGPS)GPS Sensitivity-158DbGPS FrequencyL1, 1575.42 MHzC/A ... Accuracy0.1 m/sTime Accuracy1 us synchronized to GPS timeDefault datumWGS-84Reacquisition0.1 sec., averageHot start1 sec ... hours in normal modeLED3 LED indicators showing power, GPS, GSM status and other operation status. SIM ...