It's a 100%?pro micro board for?Arduino .
Chip: ATmega32u4
Board Mode: LEDNARDO R3
Operating frequency: 16MHz
Working voltage: 5V
Input voltage: 7-12V
Digital IO port: 20
PWM channel: 7
Analog input: 12
Maximum current of 5V digital/analog port: 40mA
Maximum current of 3.3 V digital/analog port: 50 mA
Flash Memory:32 KB (ATmega32u4) of which 4 KB used by bootloader
SRAM: 2.5 KB (ATmega32u4)
EEPROM: 1 KB (ATmega32u4)

Package Content:
1 x FOR Arduino Module
1 x USB Cable?