SunFounder ESP8266 Serial Wifi Wireless Transceiver Module for Arduino UNO R3 Mega2560 Nano 802.11 b / g / n Wi-Fi Direct (P2P), soft-AP Built-in TCP / IP protocol stack Built-in TR switch, balun, LNA, power amplifier and matching network Link to view the technical details, http://wiki.sunfounder.cc/index.php?title=Esp8266_Wifi_Module