Description:The Pro Micro is similar to the Pro Mini, except for the ATmega32U4 on board. The USB transceiver inside the 32U4 allows us to add USB connections on board and remove the large external USB interface. This little little board works on the Arduino tricks you know:4 channels of 10-bit ADC, 5 PWM pins, 12 dio, as well asRx and Tx hardware serial connections. It runs at 16MHz and 5V,This board will remind you of many other favorite Arduino compatible boards, but this little guy can go anywhere. There is a voltage regulator on the board, so it can accept voltages up to 6V (blue board)/18V (black board). If you are supplying unregulated power to the board, be sure to go with the "RAW" pin, not VCC. This latest version corrects the silk error from the last version of the board so that pin 14 is correctly marked. We also added a PTC fuse and diode protector to the power circuit, and corrected the RX and TX LED circuit. Features:ATMega 32U4 runs at 5V/16MHzSupported in for Arduino I