(1) W5100 ethernet chipset .
(2) TCP/UDP stack .
(3) Rev.3 pinout with SDA/SCL/IOREF/extra pins .
(4) Supports 4 simultaneous socket connections .
(5) Houses a standardÂ RJ45 ethernet cable jack .
(6) Has an onboard micro SD card slot .
(7) LED indicators for Power, Link, Full Duplex, 100M connectivity, Tx/Rx, and Network Collisions .
(8) Reset button Â resets both the W5100 and main Freeduino motherboard .