M004

    GSM Module SIM800L with MIC & Headphone Jack SKU: M004 SIM800L is a cellular phone module, integrated SIM800L, a GSM/GPRS module, only cpmpatible with 2G network. if you want to integrate a cellular module into your design with vioce, text and SMS, this hand-solderable module is pretty nice! Series Protocol: UART Product Features              3.5 mm phone audio jack MIC (MIC is disable by default. To enable it, you will need to weld a 0 ohm resistor at MIC-EN ) Supply voltage: 3.8V - 4.2V Recommended supply voltage: 4V Power consumption: sleep mode < 2.0mA idle mode < 7.0mA GSM transmission (avg): 350 mA GSM transmission (peak): 2000mA Module size: 25 x 23 mm Interface: UART (max. 2.8V) and AT commands SIM card socket: microSIM (bottom side) Supported frequencies: Quad Band (850 / 950 / 1800 /1900 MHz) Antenna connector: IPX Spring Antenna on board Status signaling: LED Working temperature range: -40 do + 85 ° C Kit includes  1x M5Stack SIM800L Module Applications    Nitrogen dioxide alarm Automatic Web Spider SMS-notifier Remote meter reading system PinMap SIM800 SIM800 Pin ESP32 Chip TXD U2RXD(GPIO16) RXD U2TXD(GPIO17) SIM800 Pin ESP32 Chip RST GPIO5 Schematic https://m5stack.com/products/gsm‐sim800‐module/10‐2‐19