ESP8266 Serial WIFI Wireless Transceiver Module ESP-07 Send Receive LWIP AP+STA
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ESP-07: Semi-hole chip technology, all the IO leads, with metal shielding shell,
It can be had FCC CE certified IPX external antenna, can also be built-in ceramic antenna.
Features:
Model: ESP8266 ESP-07
ISM 2.4GHz
PA +25dBm
802.11 b/g/n
Warning:
This module requires a 3.3 volt supply for VCC, and 3.3V logic. It is not 5V tolant. Connect RX or TX on 5V Arduino will destroy this module. You must use a logic level converter, or a 3.3V Arduino
The 3.3V supply on the Arduino Uno has inadequate current capability to power this module. You must provide a separate, higher 3.3V supply (about 300mA or better)
The ESP8225 module is very new on the market and support and documentation for it is currently very limited.
More information, please check in below link:
http://www.esp8266.com
Translated Data Sheet
Some Translated Document
Tutorial