Device with positioning function, after GPS implements satellite positioning, sends data such as longitude and latitude, speed to the monitoring center. This function can be implemented with the support of appropriate software system. Kidnapping alarm: in case of danger, press the hidden button and the system mounted on a vehicle will send alarm signals to the monitoring center until a response is received from the monitoring center. Tracking: The monitoring center can track the vehicle after receiving the alarm. Remote shutdown: the monitoring center can remotely force the vehicle to shut down if necessary. Audio transmissions: The vehicle can be a victim of espionage for this a tiny microphone needs to be installed. Internal flash memory: When the 800C is disconnected from the system (for example, the GPRS signal is weak), the position data is stored in the flash, and then uploaded again after reconnecting to a stable GPS signal.