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.