Pro Mini 3.3V/8M 5V/16M ATMEGA328 ATMEGA328P-AU For Arduino

Chip: SIM800L

Voltage: 3.7-4.2V

Support networks: China Mobile, China Unicom global quad-band network

Module size: 2.5cm x 2.3cm

TTL serial port for serial port, you can link directly to the micro. Do not need MAX232

Power module automatically boot, home network

The integrated signal lights all the way. It flashes slowly when there is a signal, it flashes quickly when there is no signal

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