... 2 way conversation 3.alarm function, security 4. send the data SMS/GPRS Applications:·GPS Vehicle Tracking ·Vehicle Security/Recover/Anti-hijacking ... by software/by cell phone ·Over-speed alarm, Low power alarm, Geo-fence alarm ·Roaming feature to save cost ·Control or ... analog inputs auto GPS /GSM/GPRS/AGPS tracker, engine on& off, geo-fence control,over speed&low power alarm, mileage calculation