A mini wifi board with 4MB flash based on ESP8266EXProduct Specification:Support OTA on line.1 Micro USB connection.Main Chip: ESP8266 CH340G.1 analog input (3.2V max input).11 digital input/output pins, all pins have interrupt/pwm/I2C/one-wire supported(except D0).With regulator onboard, can 3.3V pin, 5V pin, and 5V Micro USB port power input, The board operating voltage is 3.3V, connect the 5V supply is also converted to 3.3V, and not advised to use more than a 5V power supply.How to get it started for Arduino:- Setup driverBefore you use the Development Board, you need to set up a CH340g driver.- PythonOn Windows, you need to install Python 2.7.10.On Linux, MAC OSX, you don't need to install it, comes preinstalled with OS.- Installing Hardware package "Boards Manager or GIT".We recommend using GIT, you can always get the latest version.Package Includes:5*2 Pcs x Normal pins 5*2 Pcs x Long female pins5*2 Pcs x Short female pins5*1 Pcs x Esp8266 D1 mini wifi board