ATmega32U4 running at 5V/16MHz Supported by for IDE v1.0.1 On-Board Micro-USB connector for programming 4 x 10-bit ADC pins, 12 x Digital I/Os Rx and Tx Hardware Serial Connections 1. The Pro-Micro is similar to the Pro mini except with a ATmega32U4 on board. The USB transceiver inside the 32U4 allows us to add USB connectivity on board and do away with bulky external USB interface. 2. This tiny little board does all of the for tricks that you're familiar with: 4 channels of 10-bit ADC, 5 PWM pins, 12 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 for -compatible boards but this can go anywhere. If you're supplying unregulated power to the board, be sure to connect to the "RAW" pin on not VCC. Colour: Blue Material: PC+Metal Package Contents: 3 x Pro-Micro ATmega32U4 5V/16MHz development board Note: 1. When you open the for IDE software, pls go to the tool and choose the board "for " 2. The acceptable voltage range is 5 to 9 V. Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.