At-18 gps/gsm tracker is a vehicle remote positioning device with built-in gps and gsm/gprs technology in compact size. It can transmit the longitude and latitude coordinates to your cell phone by the sms. User could use the coordinates to find its location on the google maps or other map software. The tracker also uploads position data to a Working field : car/motorcycle bike/ train/truck Main function : 1. Build-in gps vehicles locator. 2. Support 4-frequency gsm 850/900/1800/1900 mhz which can work worldwide 3. Support track the real time address by google link 4. Suppot gps/glonass/galileo/compass four different satellite 5. Support geo fence alarm 6. Support single location 7. Support alarm of power off 8. Support over speed alarm 9. Support mileage alarm 10. Support move alarm 11. Support low power alarm 12. Support tow alarm 13. Waterproof Neutral package