This is an Attiny85 based microcontroller development board similar to the Arduino line, only cheaper, smaller, and a bit less powerful. With a whole host of shields to extend its functionality and the ability to use the familiar Arduino IDE it is a great way to jump into electronics, or perfect for when an Arduino is too big or too much. Features : -Support for the Arduino IDE 1.0 (OSX/Win/Linux). -Power via USB or External Source - 5v or 7-35v (12v or less recommended, automatic selection). -On-board 500ma 5V Regulator. -Built-in USB. -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.