- Requires an Arduino board (not included)
- Operating voltage 5V (supplied from the Arduino Board)
- Long wire-wrap headers
- Onboard micro-SD card slot
- Ethernet Controller: W5100 with internal 16K buffer
- Connection speed: 10/100Mb
- Connection with Arduino on SPI port

The Wiznet W5100 provides a network (IP) stack capable of both TCP and UDP. It supports up to four simultaneous socket connections.