Feature bination of GPS and GPRS/GSM wireless network 2.Pocket-sized / light-weighted / Rechargeable battery included 3.No external antennae needed -- Just plug-&-play 4.A detailed GPS report includes NMEA 0183 GPRMC, which shows a user''''''''s ID and position datain the form of UTC, Latitude, Longitude, SOG, COG and its status, such as regular auto-reports, a random polling report and an alerting emergency report. This integrated report also contains GPRS/GSM net code and base station code, helping locate the position of TZ-GT02 when GPS signalis not available. Regular Report function: TZ-GT01 is configurable for SMS commands. The user can send a SMS command to adjust the interval and the message amount of T200. By configuration, T200 can send its GPS report via SMS messages according to the parameters that was configured before. Polling function: The supervisor can monitor the rover who is equipped with T200 by dialing phone randomly. Emergency Alert: When the rover is under an emergent circumstance and presses the SOS Button of T200, the device will immediately send out an emergency message along with its GPS report showing the emergency circumstance via its own built- in phone numbers. Specification: 1.Dual Band GPRS/GSM module (GPRS/GSM900/1800MHz) 2.Equipped with 20 parallel channels GPS receiver (SirF III optional) 3.Emergency Alert: SOS Button 4.Acquisition time: 5.Hot Typically < 6sec Time To First Fix (TTFF) 6.Warm Typically < 35sec TTFF Cold 7.Typically < 45sec TTFF 8.Positioning Accuracy : Less than 15 meters, SEP without SA 9.Power Supply : Standard: 3.6V DC Li-Ion battery 10.Internal GPRS/GSM antenna 11.Operation time: With Battery alone: 48hrs after fully charged; in standby mode 12.Device Size: 44*63*24.5 mm 13.Weight: 85g