Features: brand new and high quality ompliant with PCI for Express Base Specification 2.0 (5GTs) and backward for Specifications 1.1 and 1.0A;PCI Power Management Specification 1.2 Support 10/100/1000 auto-configuration; support for swap/polarity/skew correction, crossover detection and auto-correction. Support Wake-on-LAN and Remote Wake-up; Support EMAC-393 ECMA- host sleep standardSupport full-duplex flow control (IEEE-802.3X); support 9K bytes jumbo frame Fully Compliant with IEEE 802.3, IEEE 802.3u, IEEE 802.3ab; Support IEEE 802.1p-Layer 2 Priority Encoding (Prioritization); Support IEEE 802.1Q VLAN Tagging (Virtual Local Area Network); Support IEEE 802.3az-2010 Support two 1-lane 2.5Gbps PCI for Express Support hardware error correction code functionSupported operating systems: forWindows ME,98SE, 2000, XP, Vista, WIN7,WIN8,WIN10 32-/64-bit; for Windows Server 2003, 2008 and 2012 32-/64-bit; Linux,AYOS, MacOS , DOS, ROS etc Specifications: Item: 4 Port Gigabit Ethernet Network Card Chipset: RTL8111H Bus width: 2.5 Gbps PCI for Express X1 Connectors: 4 x RJ45 Data rate 10/100/1000M/ 2.5G Applicable Network Type: Gigabit Ethernet Network Standard: Compliant with IEEE 802.3, IEEE 802.3u/ 3ab/... Transmission Medium: Wired Port Type: RJ-45 LED Indicator: Yes Package Includes: 1 x 4-port Gigabit Server Network Card 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.