KeeYees Pro Micro ATmega32U4 5V 16MHz Micro USB Development Board Module Microcontroller (Pack of 3pcs)
Brand: KeeYees

Features:
ATmega32U4 running at 5V/16MHz
Recommend power supply for board: 6-7V, less than 9V
On-Board micro-USB connector for programming
4 x 10-bit ADC pins, 12 x Digital I/Os
Rx and Tx Hardware Serial Connections

How to use?
1. Connected to computer. (If this module cannot be recognized by your computer, please refer to this link to install the driver)
2. Opened Ard IDE and loaded Blink sketch.
3. Set board to Leonardo and selected the appropriate COM port (It showed up in the list already identified as a Leonardo).
4. Connected an LED to pin 9 and modified the sketch accordingly.
5. Hit upload and within a few seconds having a blinking LED.

Package Includes:
3 x Pro Micro ATmega32U4 5V 16MHz Module
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ATMega32U4 running at 5V/16MHz, maximum voltage on the RAW pin is 9V, recommended voltage 6-7V.
4 x 10-bit ADC pins, 12 x Digital I/Os; Rx and Tx Hardware Serial Connections.
Just connect to the On-Board micro-USB connector for programming. (If this module cannot be recognized by your computer, please refer to this link to install the driver)
The PRO Micro board can be powered via the micro USB connection or with an external power supply.