Feature:
ATmega32U4 running at 5V/16MHz
Compatible with Arduino IDE
On-Board micro-USB connector for programming
9x 10-bit ADC pins
12x Digital I/Os (5 are PWM capable)
Rx and Tx Hardware Serial Connections
dimension: 33.5 x 18.5 mm( 1.3 x 0.7 inch)
Package includes: 10pcs Pro Micro ATmega32U4 Module