It's like a shrunken version of the Arduino Leonardo as it features the same ATmega32U4 microcontroller, micro-USB port, and pinouts. It also operates at 5V and requires an external supply of 7 to ...

Arduino Micro pinout — The Arachnio uses the same pinout as the Arduino Micro and is only very slightly larger in order to accommodate the integrated antenna. – Breadboard compatible ...

The Arduino Tre is a pretty cool piece of kit combining a Linux system with the Arduino pinout. Care to take a guess at what the next Arduino board will be called? The Arduino Zero, obviously.