This is  for Arduino UNO R3 Mega2560 Nano, allowing it to either host the application or to offload all Wi-Fi networking functions from another application processor.

ESP-01: Esp8266 Serial Wifi Wireless Transceiver Networking Module For Arduino

Model: IM140905002

Regular Price: $4.80

Special Price $1.99

Availability: In stock

Quick Overview

ESP8266 offers a complete and self-contained Wi-Fi networking solution, allowing it to either host the application or to offload all Wi-Fi networking functions from another application processor. Perfect and simple AT commands.