Brand N/A Model 2560 R3 Quantity 1 Color Black + blue Material Heavy gold plate Features Arduino Mega is a ATmega2560 as the core of microcontroller development board itself has 54 set of digital I/O input/output end (14 groups can do PWM output) 16 groups of simulated than the input four groups of UART (hardware serial ports) use the 16 MHz crystal oscillator. Specification Operating Voltage: 5V; Input Voltage (recommended): 7-12V; Input Voltage (limits): 6-20V; Digital I/O Pins: 54 (of which 14 provide PWM output); Analog Input Pins: 16; DC Current per I/O Pin: 40 mA; DC Current for 3.3V Pin: 50 mA; Flash Memory: 256 KB of which 8 KB used by bootloader; SRAM: 8 KB; EEPROM: 4 KB; Clock Speed: 16 MHz Application Learning board; development board Other Power supply design Arduino Mega power supply system there are two options the USB power supply directly or external power supply. The choice of power supply will automatically switch. The external power supply can choose AC - to - DC adapter or battery the limits of the control panel for the 6 v to 12 v voltage range but if the voltage is less than 6 v I/O mouth may not be able to provide to 5 v voltage so will appear unstable; If the voltage is greater than 12 v voltage stabilizer will likely overheating protection are more likely to damage the Arduino MEGA. Therefore suggested operating power supply of 6.5 ~ 12 V recommend the power is 7.5 V or 9 V. English Manual/Spec http://arduino.cc/en/Main/Software Packing List 1 x Development board 1x USB cable (60cm)