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Keyestudio SIM900 GSM Shield Wireless Module Expansion Board - Yellow
SIM900 GSM/GPRS shield is based on Quad-Band SIM900 GSM/GPRS module. It provides Arduino with GSM/GPRS function. This shield allows you to make voice calls£¬ send SMS or make connections to the Internet network. On the shield£¬ there is a serial port toggle switch for you to select either software serial port or hardware serial port to be connected to GPRS Shield. If you choose software serial port£¬ you need to use the Software UART; otherwise£¬ you need to use the Hardware UART. The shield includes a high capacitor dedicated to RTC (Real Time Clock). If you toggle the switch to DBG-Port£¬ you can connect the port to Arduino or connect the port to PC by Arduino to proceed the debugging.