M5Stack M004 GSM/GPRS SIM800L 是一款蜂窝电话模块，集成了 SIM800L，一个 GSM/GPRS 模块。

Dimensions: 54.2 mm x 54.2 mm x 12.8 mm

Unit Weight: 27 g

Interface Type: UART

Supply Voltage - Max: 4.2 V

Supply Voltage - Min: 3.8 V

Operating Supply Voltage: 3.8 V to 4.2 V

Maximum Operating Temperature: + 85 C

Minimum Operating Temperature: - 40 C