Microcontroller:ATmega2560-16AU Operating Voltage:5V Input Voltage (recommended):7-12V Digital I/O Pins:54 (of which 15 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