This is a 2G and industrial wireless communication module, integrated an GSM/GPRS module M6315, released by China Mobile, supported GPRS class12 and GPRS CS-1, CS-2, CS-3, CS-4 encode, M6315 has LCC package type, features tiny dimension, highly reliability, strong anti-interference capability.
It can apply to the comunication requirement on diversity industrial, electricity, petroleum, transportation, financial, etc
In the GSM module scheme, we added more hardware resources, 1 reserved speaker- SPK1, 1 onboard speaker-SPK2, LEDs, 2 alternative antenna.
M6315 is 2.8V power input, so in the hardware of GSM module, we added a Bidirectional Voltage-Level Translator (TXS0104E), to switch the power supply to 2.8V.
M5Stack GSM Module (M6315)