ATmega32U4 running at 5V/16MHz

The ATmega32U4 chip on the Pro Micro board comes preprogrammed with a bootloader that allows you to upload new code to it without the use of an external hardware programmer.it running at 5V/16MHz and the maximum voltage allowed on the RAW pin is 9V, 6-7V input recommended.

Multi-channels

There are 4 channels of 10-bit ADC, 5 PWM pins, 12 DIOs as well as hardware serial connections RX and TX on Pro Micro. This board will remind you a lot of your other favorite Arduino-compatible boards but this little guy can go just about anywhere.

USB-C connection

The pro micro board can be powered via the USB-C connection or with an external power supply. The power source is selected automatically.The Micro appears as a generic keyboard and mouse, and can be programmed to control these input devices using the keyboard and mouse classes.

The Pro Micro is powered with an external power supply(not via the USB-C connection),please be sure to make the power connect to the "raw" pin and the ground to GND.

Voltage regulator chip

There is a voltage regulator on board so it can accept voltage up to 9V DC.The maximum voltage allowed on the RAW pin is 9V, 6-7V input recommended. If you're supplying unregulated power to the board, be sure to connect to the "RAW" pin on not VCC.