【SIM800L】 Chip: SIM800L; Voltage: 3.7-4.2V 【Compact Design】TTL serial port for serial port, you can link it directly to the microcontroller. Does not need MAX232 【High Performance】TTL serial port for serial port, can link directly to the microcontroller. I don't need MAX232. The power module starts automatically. 【COMPATABILITY】The local network is turned on. The signal lights on the dashboard light up all the way. Flashes slowly when there is a signal, flash quickly when there is no signal 【CONNECTION】 China Mobile, China Unicom and Global Quad Band Network
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