The A9G development board is a multifunctional development board based on AI Thinker’s A9G GPRS/GSM + GPS/ BDS module. You can use it to verify the basic communication and peripheral functions of A9G module. It has the basic phone/SMS, GPRS networking communications and GPS/BDS dual mode positioning function. There are lithium battery charge management, microphone, speaker interface, USB communication interface, multiple user keys/ led, TF card slot, acceleration sensor, SPI interface, I2C2 interface, ADC interface on the boards, so you can develop different functions with this board.

CH340 USB to ESP8266 Serial Wireless Wifi Module Adapter Board CH340 ESP-01 Development Microcontroller For Arduino