feature:
8-bit AVR processor (AT90USB1286)
128K flash memory, 8K RAM, 4K EEPROM
USB can emulate any type of device
Single button programming
Arduino compatible
8 analog inputs
46 digital I / O pins
Nine PWM outputs
SPI and I2C
Size: 2 "x 0.7" (50.8 x 17.8 mm)