Fangrui Product Details Features: 1. Support Rduinoide1.0+ (osx/win/linux);can Be Powered By Usb Or 5v Or 7-35v (automatic Matching) Additional Power Supply 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) 4. 12c And Spi (vis ), Pwm On 3 Pins (more Possible With Software Pwm) 5. Adc On 4 Pins, Power Led Indicator And Test/status Led (on Pin0) Description: 1. Support Rduinoide1.0+ (osx/win/linux) 2. Powered By Usb Or External Power Supply - 5v Or 7-35v (automatic Selection) 3. Car 500 Ma 5v Voltage Regulator 4. Built-in Usb (and Serial Debugging) 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 Program Over Usb) 6. 8k Flash Memory (about 6k After Bootloader) 7. I2c And Spi (relative To ) 8. Pwm On Pin 3 (software Pwm Is More Likely) 9. 4-pin Adc 10. Power Led And Test/status Led (on Pin 0) (due To Different Batches, The Characters On T