It is directly supported by Arduino official Ethernet Library
It adds a micro-SD card slot, which can be used to store files for serving over the network.
It is compatible with the Arduino Duemilanove (168 or 328), UNO as well as Mega (1280/2560) and can be accessed using the SD library.
The Wiznet W5100 provides a network (IP) stack capable of both TCP and UDP.
It supports up to four simultaneous socket connections.

Technical Details

Product Details

Product Dimensions

Package Dimensions
Width : 3.54 inch
Height : 1.38 inch
Length : 3.94 inch

Item Weight: 0 ounce (View shipping rates and policies)
Shipping Weight: 1.12 ounce (View shipping rates and policies)

ASIN : B073W36PLR