Specification:

Microcontroller:ATmega32u4
Operating Voltage:5V
Input Voltage (recommended):7-12V
Input Voltage (limits):6-20V
Digital I/O Pins:20
PWM Channels:7
Analog Input Channels:12
DC Current per I/O Pin:40 mA
DC Current for 3.3V Pin:50 mA
Flash Memory:32 KB (ATmega32u4) of which 4 KB used by bootloader
SRAM:2.5 KB (ATmega32u4)
EEPROM:1 KB (ATmega32u4)
Clock Speed:16 MHz
Length: 68.6 mm
Width: 53.3 mm