<b>on-line instructions: http://osoyoo.com/2018/06/25/osoyoo-pro-micro-board <br>Note:When you open the IDE software, pls go to the Tool and choose the board "Leonardo"<br><br>We have tech support for after-sale. If it can't be recognized by your computer when you use it, please change another USB cable or computers to test, if still no any update, may you need to install a driver , we made a detail tutorial, you can visit: https://youtu.be/9k5mk-FHF24 if still not solved it, please tell us.We can definitely help you to fix the problem .<br> <br> 1. The Pro Micro is similar to the Pro mini except with a ATmega32U4 on board. The USB transceiver inside the 32U4 allows us to add USB connectivity on board and do away with bulky external USB interface <br> 2. This tiny little board does all of the neat-o tricks that you're familiar with: 4 channels of 10-bit ADC, 5 PWM pins, 12 DIOs as well as hardware serial connections Rx and Tx. Running at 16MHz and 5V, this board will remind you a lot of your other favorite pro-compatible boards but this little guy can go just about anywhere. If you're supplying unregulated power to the board, be sure to connect to the "RAW" pin on not VCC. <br> 3. This latest revision corrects the silk error from the last version of the board so that pin 14 is correctly labeled. We've also added a PTC fuse and diode protection to the power circuit and corrected the RX and TX LED circuit. <br> <br> Feature: <br> ATmega32U4 running at 5V/16MHz <br> Supported under IDE v1.0.1 <br> Recommand power supply for board: 6-7V, less than 9V <br>On-Board micro-USB connector for programming <br> 4 x 10-bit ADC pins <br> 12 x Digital I/Os (5 are PWM capable) <br> Rx and Tx Hardware Serial Connections <br> Our Smallest pro-Compatible Board Yet <br> <br> Package includes: <br> 1 x OSOYOO Pro Micro ATmega32U4 Module