Adafruit Feather HUZZAH with ESP8266 WiFi [ADA2821]
Brand: Adafruit

Feather is the new development board from Adafruit, and like its namesake it is thin, light, and lets you fly! We designed Feather to be a new standard for portable microcontroller cores. This is the Adafruit Feather HUZZAH ESP8266 - our take on an 'all-in-one' ESP8266 WiFi development board with built in USB and battery charging. Its an ESP8266 WiFi module with all the extras you need, ready to rock! Measures 2.0" x 0.9" x 0.28" (51mm x 23mm x 8mm) without headers soldered in Light as a (large?) feather - 9.7 grams ESP8266 @ 80MHz with 3.3V logic/power 4MB of FLASH (32 MBit) Built in WiFi 802.11 b/g/n 3.3V regulator with 500mA peak current output CP2104 USB-Serial converter onboard with 921600 max baudrate for speedy uploading Auto-reset support for getting into bootload mode before firmware upload 9 x GPIO pins - can also be used as I2C and SPI 1 x analog inputs 1.0V max Built in 100mA LiPoly charger with charging status indicator LED, can also cut a trace to disable the charger Pin #0 red LED for general purpose blinking. Pin #2 blue LED for bootloading debug & general purpose blinking Power/enable pin 4 mounting holes Reset button