This PCIe to 4-port 2.5G Ethernet network adapter can provide 2.5 Gigabit Ethernet network faster than Gigabit network speed, support high-performance dual-channel network and full-duplex communication to achieve speeds up to 2500 Mbps and fast transfer rate, compatible with existing Ethernet. Driver Download: https://.realtek.com/-/component/zoo/category/network-interface-controllers-10-100-1000m-gigabit-ethernet-pci-express-software Supports 2.5G Lite (1G data rate) mode. Supports PCI Express 2.1. Supports 4 high performance 2.5-Gigabit LAN ports. Auto-Negotiation with Extended Next Page capability (XNP). Compatible with NBASE- Alliance PHY Specification. Supports pair swap/polarity/skew correction. Crossover Detection & Auto-Correction. Supports hardware ECC (Error Correction Code) function Supports hardware (Cyclic Redundancy Check) function Transmit/Receive on-chip buffer support Supports PCI (Message Signaled Interrupt) and -X Supports power down/link down power saving/PHY disable mode Supports ECMA-393 ProxZzzy Standard for sleeping hosts Supports LTR (Latency Tolerance Reporting) Supports 32-set 128- Frame pattern exact matching Supports WPI (Wake Packet Indication) Supports PCIe L1 substate L1.1and L1.2 Compatible with IEEE 802.3, IEEE 802.3u, IEEE 802. Supports IEEE 1588v1, IEEE 1588v2, IEEE 802.1AS time synchronization Supports IEEE 802.1Qav credit-based shaper algorithm Supports IEEE 802.1P Layer 2 Priority Encoding Supports IEEE 802.1Q VLAN tagging Supports IEEE 802.1ad Double VLAN Supports IEEE 802.3az (Energy Efficient Ethernet) Supports IEEE 802.3bz (2.5GBase-T) Supports Full Duplex flow control (IEEE 802.3x) Supports jumbo frame to 16K Supports standard and low profile chassis System Requirement Windows OS Linux, for OS and DOS PCI Express-enabled system with an available PCI Express slot. Material: PCB+Metal colour: black Package Contents: 1 x PCI-Express to 4 Ports 10 /100/1000M/2.5G Ethernet Card 1 x Low-profile bracket 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.