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The board is provided with the Fala capacitor on the module of the RTC power supply. Debug toggle switch, you can set the sim900A debug port connected to the Arduino or through the Arduino ATMEGA8U2/FT232 connected to a PC, debug debugging 3.3V and 5V level compatible, can be adaptive 3.3V or 5V main control board, support maple leaf and Chipkit 3.3V this kind of other platform development board. After the SIM900A Arduino board is plugged in, it must provide the DC 9V/2A power supply. Four frequency 850/900/1800/1900MHz GSM/GPRS.