Digital I/O Pins:
• 20 digital pins
○ 7 pins support PWM output

Analog Input Pins:
• 12 analog inputs

DC Current per I/O Pin:
• 20 mA

DC Current for 3.3V Pin:
• 50 mA

Flash Memory:
• 32 KB (4 KB used by bootloader)

SRAM:
• 2.5 KB

EEPROM:
• 1 KB

Clock Speed:
• 16 MHz

Special Feature:
• Native USB support (can act as keyboard, mouse, joystick)

Communication Interfaces:
• UART (via USB CDC)
• I2C
• SPI

USB Connection:
• Micro-USB

ICSP Header:
• Yes

RESET Button:
• Yes

Dimensions:
• 68.6 mm × 53.4 mm

Weight:
• 20 g