GSM Module SIM800L Stackable IoT Development Board ESP32 With MIC & 3.5mm Headphone Jack M5Stack for Arduino - products that work with official Arduino boardsDescription: M5Stack GSM Module GPRS Board SIM800L Development Board for ESP32 Electronic PCB DIY The default use of serial port 2, you can also manually jump to other IO port. GPIO TXD GPIO17 RXD GPIO5 RST Package included: 1 x M5Stack GSM Module
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GSM Module SIM800L Stackable IoT Development Board ESP32 With MIC & 3.5mm Headphone Jack M5Stack for Arduino - products that work with official Arduino boards