3pcs Pro Micro ATmega32U4 5V 16MHz Development Board Micro-Controller Board for Leonardo Compatible with Arduino IDE with Pin Header

The USB transceiver inside the 32U4 allows us to add USB connectivity on-board and do away with external USB interface. 9 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 Development boards such as Nano board. It can accept voltage up to 9V DC as there is a voltage regulator on board.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. 4 x 10-bit ADC pins, 12 x digital I/Os,Rx and Tx hardware serial connections each one is in their own anti-ESD bag with 2 rows of header pins.