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![GSM Modem - RS232 - SIM800A [5276] : Sunrom Electronics](https://www.sunrom.com/media/content/1062/gsm-pinout.jpg "GSM Modem - RS232 - SIM800A [5276] : Sunrom Electronics")
GSM Modem - RS232 - SIM800A [5276] : Sunrom Electronics
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