This document compares several Arduino boards. It provides specifications for the Arduino Uno, Leonardo, Mega 2560, Micro, and Due. The specifications included are the microcontroller used, operating voltage, input voltage range, digital and analog I/O pins, memory, and clock speed. The document also briefly mentions several other Arduino boards including the Yun, Tre, Robot, Esplora, Mega ADK, Ethernet, Mini, LilyPad, Nano and Pro Mini.