ESP8266EX

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Product Link

https://openelab.io/products/espressif-cost-esp8266-ic-module?_pos=1&_sid=69bd27698&_ss=ropenelab.io

https://www.espressif.com/sites/default/files/documentation/0a-esp8266ex_datasheet_en.pdfwww.espressif.com