- Frequency: 16MHz
- Power Voltage: 5V
- 12x Digital I/Os
- Rx and Tx Hardware Serial Connections
The SparkFun Pro Micro Arduino Board comes with an USB transceiver inside the 32U4 board that allows you to add USB connectivity on-board and do away with bulky external USB interface. A voltage regulator on board can accept voltage up to 12 VDC.