HALJIA 3Pcs Pro Micro Atmega32U4 5V 16MHz Bootloadered IDE Micro USB Pro Micro Development Board Microcontroller Compatible with Arduino Pro Micro Serial Connection with Pin Headers

The Micro is a microcontroller board based on the Atmega32u4, developed in conjunction with Adafruit. It contains everything needed to support the microcontroller; simply connect it to a computer with a micro USB cable to get started. It has a form factor that enables it to be easily placed on a breadboard. The Micro is similar to the Leonardo in that the ATmega32u4 has built-in USB communication, eliminating the need for a secondary processor. This allows the Micro to appear to a connected computer as a mouse and keyboard, in addition to a virtual (CDC) serial / COM port. Feature:ATmega32U4 running at 5V/16MHzSupported under Arduino IDE v1.0.1Recommend power supply for board: 6-7V, less than 9VOn-Board micro-USB connector for programming4 x 10-bit ADC pins, 12 x Digital I/OsRx and Tx Hardware Serial ConnectionsDimension: 33mm*18mmWeight: 3.7gUsage:Connected to computer.Opened Arduino IDE and loaded Blink sketch.Set board to Leonardo and selected the appropriate COM port (It showed up in the list already identified as a Leonardo).Connected an LED to pin 9 and modified the sketch accordingly.Hit upload and within a few seconds having a blinking LED. Packing List:3 x Arduino Pro Mini ATmega32U4 Module