Ai-Thinker ESP-12F ESP8266 Serial WiFi Module

The ESP-12F is one of the most widely adopted ESP8266 module revisions, refined over earlier ESP-12 variants with a better RF layout for more consistent WiFi performance, and it's the exact module found inside many commercial NodeMCU boards and WiFi relay products. Carrying it as a standalone genuine Ai-Thinker module gives a builder that same proven WiFi core to design directly into a custom board rather than cannibalizing a finished dev board for it.