Ethernet Shield W5100 R3 for UNO Mega 2560 UNR R3 W5100 Development board.With this Ethernet Shield, your UNO R3 board can be used to connect to internet.Can be used as server or client.Directly plug puzzle board, no soldering required.It is directly supported by UNO R3 official Ethernet Library.It adds a micro-SD card slot, which can be used to store files for serving over the network.Features:1. With this Ethernet Shield, your UNO R3 board can be used to connect to internet.2. Can be used as server or client.3. Directly plug puzzle board, no soldering required.4. Controller: w5100.5. This is the latest version of the Ethernet Shield.6. This Ethernet Shield which is based on the Wiznet W5100 Ethernet Chip gives you an easy way to get your uno r3 Online.7. It adds a micro-SD card slot, which can be used to store files for serving over the network.8. It is compatible with the (168 or 328), Uno as well as Mega (1280/2560) and can be accessed using the SD library.9. The Wiznet W5100 provides a network (IP) stack capable of both TCP and UDP.10. It supports up to four simultaneous socket connections.11. Use the Ethernet library to write sketches which connect to the internet using the shield.12. Fits all version of Main board,2009,UNO, mega 1280, mega 2560.13. Size:7cm x 5.4cm x 2.4cm – 2.76inch x 2.12inch x 0.94inch.Package Included 1 x Ethernet Shield