- Standard interface that can be expanded in a variety of development boards - I2C Serial port to 8-bit parallel port , support expand into 8×8 = 64 at most - PCF8574 IO expansion chip with I2C interface, 8-bit parallel port output - Applicable to a variety of platforms including Arduino / AVR / ARM - With this module, you can use only 2 ports of your Arduino or Raspberry Pi board to control up to 8 digital I/O ports. - Material: Plastic - Size: Approx. 55x15x1mm