Description:

Model:ESP8266-12 

ISM 2.4GHz
PA +25dBm
802.11b/g/n

 Warnings:

 1.This module requires a 3.3 volt supply for VCC, and 3.3V logic.

 2.It is not 5V tolant,Connect RX or TX on 5V for Arduino will destroy this module.

 3.You must use a logic level converter, or a 3.3V for Arduino

 4.The 3.3V supply on the for Arduino Uno has inadequate current capabilit to power this

module.

 5.You must provide a separate,higher 3.3V supply(about 300mA or better)