seeed studio W5500 Ethernet Shield The shield also have two grove connectors and a microsd card socket to support projects which require storing large amounts of data from grove sensor. The rj45 port (where the ethernet cable is connected to) is low enough to allow you to stack more shields on top of this one if needed. Led outputs (full/half duplex, link, speed, active).10baset/100basetx ethernet phy embedded.supports power down mode.supports hardwired tcp/ip protocols : tcp, udp, icmp, ipv4, arp, igmp, pppoe Supports wake on lan over udp.supports 8 independent sockets simultaneously.internal 32kbytes memory for tx/rx buffers Supports high speed serial peripheral interface(spi mode 0, 3).supports auto negotiation (full and half duplex, 10 and 100* based )