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SIM800A GSM GPRS Module is an upgraded version of SIM900A, you can create various projects using this module, For example, IoT gateways, security alert systems, DTMF-based home automation, etc. Integrating pulse source and buffer IC is compactly designed but still retains the necessary elements of the Sim module design such as logic signal transfer circuit using Mosfet, IC RS232 (MAX232) communication, high current pulse source circuit, standard sim slot, and signalling LEDs, Board comes with external SMA GSM antenna.