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Some of them have been certified, check out the raw module and nice breakout version from Adafruit (both FCC certified modules): https://www.adafruit.com/products/2491 and https://www.adafruit.com/products/2471

edit: See also: http://hackaday.com/2014/12/17/esp-gets-fcc-and-ce/

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This is incorrect. No currently available module has passed FCC modular certification. The ESP8266EX chips themselves have passed certification, but that's only one part of the process. The 'certification' reached by the ESP-12 module is suspect. Additionally, I've yet to see an ESP8266 module marked with a legitimate FCC ID (which is required for a certified module).

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