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The SIM800A Simcon GSM/GPRS Module with UART Interface. The SIM800A supports quad-band 850/900/1800/1900 MHz and can transmit voice, SMS, and data information while consuming little power. Using USB to Serial connector and SMA antenna connector are included. The LM317 voltage regulator on board can provide regulated 5V at up to 1A voltage to the board and connecting circuit. An additional Berg strip is provided for GND, +5V, and +9V external connections. The GSM800A can communicate with any microcontroller, such as the Raspberry Pi, 8051, PIC, ARM, and AVR.