Designed as a Wi-Fi adapter connecting to a serial MCU using a 4pin PH2.54 connector. Powered by 5V only! Module has 4MB flash.
Using demale Dupont cables connect RX, TX and GND lines to the serial-to-USB adapter. Provide stable 5V power to the 5V pin with a common GND. Ground GPIO0 accessed on the back of the module.