T-Call

ESP32 Wireless Module SIM Antenna WiFi Bluetooth Development Expand Board Devkit for Arduino Specifications For SIM800 MCU ESP32 GSM/GPRS SIM800H SIM Nano Card Slot Yes [2G] ESP32 Clock Speed 240Mhz Flash 4MB/8MB PSRAM 8MB Wireless Connectivity Wi-Fi: 802.11 b/g/nBluetooth: v4.2 BR/EDR and BLE Button EN Charging IC IP5306 Serial Chip CH9102 Peripheral Interfaces  I2C、SPI、UART、SDIO、、I2S、CAN Power Supply Support USB Type-C / Li-Po Battery Dual Power Supply JST Connect type: JST PH 2pin 2.0mm [USB can power the battery] Others Supports pin extension of Mic and Speaker  [Ship without mic and speaker by default] For T-Call A7670   Notice Connect the power supply, click to start, after the start, click to reset, and click twice to shut down. Sample Code For Reference [Github] If you need technical support please check the below link to find more details. For T-Call SIM800 For T-Call 7670 Pin Diagram Tips What's In The Box SIM800H 1 X SIM800H