Ethernet expansion shield for Arduino

Model: W5100.
Ethernet expansion shield for Arduino
This Ethernet Shield, which is based on the Wiznet W5100 Ethernet chip, offers you an easy way to achieve connectivity. It is supported directly by the official Ethernet library. Adds a micro-SD card slot, which can be used to store files to serve over the network. It is compatible with Duemilanove (168 or 328), Uno and Mega (1280/2560) and can be accessed via the SD library.
Specifications:
Operating voltage: 5V DC.
Ethernet chip: Wiznet W5100.
Ethernet speed: 10/100 Mbps.
RJ45 connector.
Interface: SPI.
Compatible with Arduino UNO, Mega, Leonardo.
MicroSD card reader.