Mega 2560 R3 development board by Keyestudio, fully compatible with Arduino MEGA 2560 REV3. It features 54 digital input/output pins (15 of which can be used as PWM outputs), 16 analog inputs, 4 UARTs, 16MHz crystal oscillator, USB connection, power jack, 2 ICSP headers, and a reset button. There are 2 automatic interchangeable power options for the Arduino Mega system, direct power via USB or external power which can be an AC-to-DC adapter or battery. A USB power cable is included in the package.