The Specs:

1. Support for the  IDE  (OSX/Windows/Linux).2. Power via USB or External Source or 7-16 v to 5 v (automatic selection).3. The On - board, 150 ma 5 v Regulator.4. Built - in USB and serial was debugging).5. 6 I/O Pins (2 are informs the for USB only if your program actively communicates over USB, otherwise you can use all 6 even if you are programming via USB).6. 8 k Flash Memory (about 6 k after bootloader).7. The I2C and SPI (vis USI).8. PWM on 3 pins (more possible with Software PWM).9. The ADC on 4 pins.10. The Power LED and the Test/Status leds.