This module integrates a MCU (Micro Control Unit) and the entire system is small, so it is easy to be embedded and mounted on the transport vehicle. The MCU ATMEAG 128 is today's mainstream. Atemga128 MCU is a low-power 8-bit AVR microprocessor. Onboard SIM900A (SIM is short for Subscriber Identity Module) is industrial SIMCOM dual-band GSM (Global System for Mobile communication) / GPRS (General Packet Radio Service) module of the SIMCOM company. Its working frequency is dual-band of 900/1800 Mhz. Moreover, it can transfer voice, SMS (Short Message Service), data and fax messages with low power consumption. GPRS can meet the requirements of long-range goal of a small amount of data moving in constant communication, and the GPRS the design uses has the advantage of a better and wider range of signal coverage.