WI-FI ESP8266-PRO module is based on widely explored esp8266 System on Chip from Expressif.WI-FI ESP8266-PRO it is light version of NodeMCU board. WIFI ESP8266-PRO dont have USB-TTL serial converter. For programming from USB, need connecting to USB-TTL converter like CH340G, or any other serial programming module.It is similar if compare Arduino Nano and Arduino Pro Mini.It combined features of WI-FI accesspoint and station + microcontroller and uses simple LUA based programming language. WIFI ESP8266-PRO offers - Arduino-like hardware I/O. And can programming with Arduino IDE.Event-driven API for network applications 10 GPIO's D0-D10, PWM functionality, IIC and SPI communication, 1-Wire and ADC A0 etc. all in one boardWi-Fi networking (can be uses as access point and/or station, host a web-server), connect to internet to fetch or upload data.For developing can use install to breadboard.