Adafruit Intermediate Soldering Pack Manual page 3

Adafruit METRO Board
The Adafruit METRO board uses the Atmega 328, a favorite core that also resides on the Arduino
boards. This board allows you to use 3.3V logic if desired and uses a Micro-USB port.
Detailed specifications from Adafruit.com:

ATmega328 microcontroller with Optiboot (UNO) Bootloader

USB Programming and debugging via the well-supported genuine FTDI FT231X

Input voltage: 7-9V (a 9VDC power supply is recommended)

5V regulator can supply peak ~800mA as long as the die temp of the regulator does not
exceed 150*C

3.3V regulator can supply peak ~150mA as long as the die temp of the regulator does
not exceed 150*C

5V logic with 3.3V compatible inputs, can be converted to 3.3V logic operation

20 Digital I/O Pins: 6 are also PWM outputs and 6 are also Analog Inputs

6-pin ICSP Header for reprogramming

32KB Flash Memory - 0.5K for bootloader, 31.5KB available after bootloading

16MHz Clock Speed

Compatible with "Classic" and "R3" Shields

Adafruit Black PCB with gold plate on pads

53mm x 71mm / 2.1" x 2.8"

Height (w/ barrel jack): 13mm / 0.5"

Weight: 19g

Derivative of Arduino UNO R3 Reference design
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Solder down the headers on an
Adafruit METRO 328 board.