Various interfaces can be selected: direct bus, indirect bus and SPI bus Support hardware TCP/IP protocol stack, support TCP,UDP,ICMP,IGMP,IPv4, ARP,PPPoE Up to 4 independent ports Internally integrated 16KBYTE transceiver cache A variety of information indicates output, including rx, tx, full/duplex, colision, link, speed W5100 is a multifunctional single-chip network interface chip with 10/100 Ethernet controller integrated inside, which is mainly used in embedded systems with high integration, high stability, high performance and low cost. Using W5100 can realize Internet connection without operating system. The W5100 is compatible with IEEE802.3 10BASE-T and 802.3u 100BASE-TX. W5100 integrates the TCP/IP protocol stack, Ethernet media transport layer (MAC) and physical layer (PHY) which are all hardware and have been verified by the market for many years. The use of W5100 does not need to consider the control of Ethernet, but only needs simple Socket programming. Support automatic polarity conversion (DMI/MDIX) 3.3V power supply, IO signal is compatible with 5V voltage With its own network port, double rows of 2x14 2.0mm pins Compatible with for Arduino's official Ethernet library. Color:Red Material:PCB Package Contents: 1 * Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.