Product description
The ODROID Net Card adds 4 additional 2.5 GbE Ethernet ports to the H-series. Using a H3/H4 you end up with a total of 6 x 2.5 GbE Ethernet ports.
The ODROID H3/H4 with the ODROID Net card brings new capabilities and applications. For example you can implement a router or gateway for up to 5 (H3/H4) clients at 2.5 GbE speed on each port.
You have to flash GLK-ESF BIOS to use Net Card.
More information is available on the website of Hardkernel.