This development board is a ESP8266 ESP-12 full evaluation board,
The core ESP8666 module was mounted on a PCB with all the GPIO broken out.The board is powered by 3 x AA cells, and an onboard regulator ensures a neat 3.3V supply for the ESP8266.
Furthermore, each GPIO has an LED connected so you can quickly test your code without connecting external hardware, and a LDR to test the ADC.
When searching for this over a WiFi network, the device name is "AI-THINKER" and the password is "ai-thinker". Theere is also a example app for you to test this module with your android phone, please download here.