1.  Compatible with IDE 1.5 (OSX/Win/Linux) 2.  Fully signed drivers and executable for easy installation 3.  USB programming, USB device emulation, USB-CDC virtual serial port emulation 4.  16 MHz AVR MCU - using a true 16Mhz precision crystal 5.  16KB Flash Memory (14.5K+ after bootloader) 6.  Serial over USB debugging and communication! 7.  14 i/o Pins (2 shared with USB) 8.  I2C, true SPI, UART, LIN, and USI 9.  ADC on 10 pins 10. 3 PWM Channels (which can be assigned to a selection of pins) 11. Power via USB, or External Source - 5v or 6-16v (automatic selection)  12. On-board button that can be used as a reset, program, or user button - or can be disabled to use that pin as general i/o - without changing the bootloader 13. On-board 150mA 5V regulator 14. Power LED and Test/Status LED (on Pin 1) 15. User accessible solder jumpers to disable LEDs, and other features for lower power consumption 16. Two mounting holes. 17. Breadboard compatible pin out/spacing