Features: M. 2A+E KEY RTL8125B 2.5G Single Port Multi Gigabit Networking Adapter Combining IEEE802.3 compatible media access controllers with Ethernet transceivers to 10/100Mbps Ethernet IEEE802.3u specification, IEEE802.3ab1000Mbps Ethernet specification, and IEEE802.3bz 2500Mbps Ethernet specification. It also provides high-speed transmission through CAT5e UTP cable or CAT3 UTP (only 10Mbps) cable5G Networking speed provides a faster Networking connection experience. M. A+E Networking card adapter upgrades laptops or desktops to 5G networkings without the need to replace the entire Networking card. Suitable for computer users who require high-speed Networking connecting, such as gamers, video editor, and remote office workers. Specifications: Networking type: M.2 A+E Gigabit Ethernet Adapter Main controller: RTL8125B Bus slot: M.2 A+E Key Bus mini pcie Transmission medium: 1x 2.5G RJ45 Transmission rate: 2500Mbps 2.5G/1000/100Mbps Networking mode: Supports 2.5G and 1G modes Networking topology: Supports IEEE1588v1, IEEE1588v2, Support：IEEE802.3az-2010 Package Includes: 1PC M.2 A+E Gigabit Ethernet Adapter 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.