Features 1、With this Ethernet Shield, your 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、This Ethernet Shield is based on the W5100 Ethernet Chip 5、It adds a micro‑SD card slot, which can be used to store files for serving over the network Specification Features: 1. With this Ethernet Shield, your board can be used to connect to internet. 2. Can be used as server or client. 4. This Ethernet Shield is based on the W5100 Ethernet Chip 5. It adds a micro-SD card slot, which can be used to store files for serving over the network. 6. The W5100 provides a network (IP) stack capable of both TCP and UDP. 7. It supports up to four simultaneous socket connections. 8. Suitable for Arduino motherboard (all versions), for UNO, for mega 1280, for mega 2560. 9. Use the Ethernet library to write sketches which connect to the internet using the shield. Specifications: Material: Plastic Size: 68.8 * 53.3 * 1.6 mm / 2.7 * 2.1 * 0.06in Weight: Approx. 28g Package List: 1 * Expansion Board