This product is either discontinued or we cannot get that from suppliers.
Qnap Dual-port 10g Base Expansion Card LAN-10G2T-X550, 10Gigabit Ethernet Card, Twisted Pair, 10GBase-T, FF Plug-in Card.
The Dual-Port 10GBASE-T Network Expansion Card from QNAP. This network expansion card is designed for rackmount and tower models and supports the 10GBASE-T Ethernet standard.