Adafruit Feather HUZZAH ESP8266 User Manual

Power Pins
GND - this is the common ground for all power and logic
BAT - this is the positive voltage to/from the JST jack for the optional Lipoly
battery
USB - this is the positive voltage to/from the micro USB jack if connected
EN - this is the 3.3V regulator's enable pin. It's pulled up, so connect to ground
to disable the 3.3V regulator
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Adafruit Feather HUZZAH ESP8266 Specifications

General

Brand	Adafruit
Model	Feather HUZZAH ESP8266
Category	Microcontrollers
Language	English