This device has based on Ethernet chip Wiznet W5100 (datasheet) that allows you to connect an Arduino board or Seeeduino to a LAN using the Ethernet library. SeeedWiznet supports up to four simultaneous socket connections.The digital pins 10, 11, 12 and 13 Arduino or Seeeduino are used to communicate with the W5100 chip, so when using SeeedWiznet, these pins cannot be used as I/O. The reset button on the card will reset both the W5100 chip that the Arduino board or Seeeduino. It can be used with the Arduino MEGA board or SeeeduinoMega11.