The Micro runs on an ATmega32u4 processor with native USB communication. It can be configured via software whether the board is recognised as a standard Arduino, a mouse or keyboard.
The Micro is a microcontroller board based on the ATmega32U4, developed in conjunction with Adafruit. It has 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16 MHz crystal oscillator, a micro USB connection, an ICSP header, and a reset button. 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 board is similar to the Arduino 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.
Specifications:
Operating Voltage: 5V
Input Voltage (recommended): 7-12V
Digital I/O Pins: 20
PWM Channels: 7
Analog Input Channels: 12
DC Current per I/O Pin: 20 mA
DC Current for 3.3V Pin: 50 mA
Flash Memory: 32 KB (ATmega32U4) of which 4 KB used by bootloader
SRAM: 2.5 KB (ATmega32U4)
EEPROM: 1 KB (ATmega32U4)
Clock Speed: 16 MHz
LED_BUILTIN: 13
Length: 48 mm
Width: 18 mm
Weight: 13g