ESP8266

The ESP8266 is a low-cost Wi-Fi chip with full TCP/IP stack and MCU (Micro Controller Unit) capability produced by Shanghai-based Chinese manufacturer, Espressif Systems. Wikipedia

Low-power, highly-integrated Wi-Fi solution. A minimal of 7 external components. Wide temperature range: -40°C to +125°C. ESP8285 - ESP8266 embeded with 8 Mbit flash. Homepage