Arduino-Compatible Mega2560 R3 ATmega2560 ATMega16U2 Dev Board + USB Cable
It has 54 digital input/output pins (of which 15 can be used as PWM outputs), 16 analog inputs, 4 UARTs (hardware serial ports), a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button.