Powerful 32-bit CPU from ARM working at 3.3 Volts. Onboard: 54 Digital I/O pins, 16 Analog Inputs, 4 UARTs, 2 DAC (Digital to Analog Converter), a CAN Bus port, a virtual COM port, and 2 TWI (I2C) Communication Ports. Arduino Due has two micro-USB connectors: one for programming and serial communication, and one for faster USB native communication, which can be used to connect peripherals such as mice or keyboards. Expanded SPI Bus functionality: simultaneously communicate with multiple devices transmitting at different speeds, such as sensors or SD card readers. The Arduino Due has an efficient switching voltage regulator, it can host devices attaching a USB device to the micro-A usb connector, so that the board will provide the power to the device. Arduino Due is compatible with Arduino shields that work at 3.3V, including most shields designed for Arduino UNO.