Features: brand new and high quality Auto-negotiation with extended next page function Support for exchange/sex/skew correction for Cross detection and automatic correction Support hardware ECC (error correction code), hardware CRC (cyclic redundancy check) function Support PCI MSI (message signal interrupt) and MSI-X; Support ECMA-393 ProxZzzy standard for sleep host Support Wake on LAN and "RealWow!" technology (remote wake up) Specifications: Applicable Network: Gigabit Ethernet Main Controller: RTL8125B Bus type: PCIe x1 2.5Gbps/5.0Gbps, revision v2.1 Transmission medium: 1 x 2.5G RJ45 port Transmission rate: 2.5G/1000/100 Network mode: support 2.5G and 1G Lite mode Network topology:-Support IEEE1588v1, IEEE1588v2, IEEE80.2AS for time synchronization Supports shaping algorithm based on IEEE802.1Qav credit Support IEEE802.1P layer 2 priority coding Support IEEE802.1Q VLAN tag; IEEE802.3az-2010; IEEE802.3bz-2016 (NGBASET) Support full duplex flow control (IEEE802.3x) Transmission Rate :100M/1G/2.5Gbps Size: approx 129X68mm/5.08x2.68in Support Linux, Win 7/Win 8/Server 2008/Win 8.1/Server 2012/ Win 10 32/64bit; One available PCI for Express x1/x4/x8/x16 slot. Package Includes: 1 x PCIe RTL8125B 2.5G Single Electrical Port Network Card 1 x CD-Driver 1 x Low-profile Bracket note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.