4. 12C And SPI (VIS ), Pwm On 3 Pins (More Possible With Software PWM) 2. There Is A 500mA 5V Regulator On The Motherboard, USB Embedded (Serial Port Debugging) 3.6 I/Opins (2 For USB Support), 8k Flash Memory (About 6K After Bootloader) Features: 1. Support Rduinoide1.0+ (OSX/Win/Linux);Can Be Powered By USB Or 5V Or 7-35V (Automatic Matching) Additional Power Supply 5. ADC On 4 Pins, Power Led Indicator And Test/Status Led (On Pin0), Weight: 0.0220462262 pounds, Manufacturer: Ehwisbe