Specification: Features:_x000D_1. Support for Arduino IDE 1.0+ (for OSX/Win/Linux)._x000D_2. Power via USB or External Source - 5V or 7-35V (12V or less recommended, automatic selection)._x000D_3. On-board 500ma 5V Regulator._x000D_4. Built-in USB._x000D_5. 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)._x000D_6. 8k Flash Memory (about 6k after bootloader)._x000D_7. I2C and SPI (vis USI)._x000D_8. PWM on 3 pins (more possible with Software PWM)._x000D_9. ADC on 4 pins._x000D_10. Power LED and Test/Status LED. _x000D__x000D_Specification:_x000D_Size: about 2*1.7cm/0.79*0.67inch_x000D_Package Size: about 8*6*1cm/3.15*2.36*0.39inch_x000D_Material: ABS_x000D__x000D_Package List:_x000D_1 * Module Features: 1Support for Arduino IDE 1.0+ (for OSX/Win/Linux). 2Power via USB or External Source - 5V or 7-35V (12V or less recommended, automatic selection). 3On-board 500ma 5V Regulator. 46 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). 58k Flash Memory (about 6k after bootloader). PackageList: