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Feature

Support for Arduino IDE 1.0+ (OSX/Win/Linux).
Power via USB or External Source - 5V or 7-35V (automatic selection).
On-board 500mA 5V Regulator.
Built-in USB (and serial debugging).
6 I/O Pins (2 are used for USB only if your program actively communicates over USB, otherwise you can use all 6 even if you are programming via USB).

Description

Features:
Support for Arduino IDE 1.0+ (OSX/Win/Linux).
Power via USB or External Source - 5V or 7-35V (automatic selection).
On-board 500mA 5V Regulator.
Built-in USB (and serial debugging).
6 I/O Pins (2 are used for USB only if your program actively communicates over USB, otherwise you can use all 6 even if you are programming via USB).
8k Flash Memory (about 6k after bootloader).
I2C and SPI (vis USI).
PWM on 3 pins (more possible with Software PWM).
ADC on 4 pins.
Power LED and Test/Status LED (on Pin0).

Specifications:
Size: 25 * 20mm / 0.98 * 0.8in
Package Size: Approx. 6 * 4 * 1cm
Package Weight: Approx. 11g

Package List:
3 * Micro USB Development Board(with Pins)