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Arduino Micro without Headers [A000093]
Simply connect it to a computer with a micro USB cable to get started. Its form factor (L:4.8cm x W:1.77cm) makes it easy to integrate it in everyday objects and make them interactive.
The Arduino Micro board includes an ATmega32U4 microcontroller with built-in USB communication, ready to be plugged to your computer.
The board can be powered via the micro USB connection or using an external power supply (recommended range is 7 to 12 Volts). The power source will be automatically selected.
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.
This model is sold without headers, it makes it ideal for highly integrated setups.