MEGA 2560 R3 Module ATMEGA2560-16AU ATMEGA16U2 Board W/USB Cable For Arduino
It has 54 digital input/output pins (of which 14 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.