Qunqi W5100 Ethernet Shield Network Development board with Micro SD Card Slot for Arduino This Arduino Ethernet Shield which is based on the Wiznet W5100 Ethernet Chip gives you an easy way to get your Arduino Online.Will not work with Homeseer Arduino Pkug-in The Wiznet W5100 provides a network (IP) stack capable of both TCP and UDP. With Micro SD card slot, supports SD card up to 2GB, supports 2009, UNO, mega 1280, mega 2560, Nano, Duemilanove Fit for Arduino 2009 UNO Mega 1280 Mega 2560 Nano Duemilanove It adds a micro-SD card slot, which can be used to store files for serving over the network. W5100 Ethernet Shield Network Development board This is the latest version of the Ethernet Shield. This Arduino Ethernet Shield which is based on the Wiznet W5100 Ethernet Chip gives you an easy way to get your Arduino Online. 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. Use the Ethernet library to write sketches which connect to the internet using the shield. Fits all version of arduino Main board,2009,UNO, mega 1280, mega 2560.