Features: brand new and high quality Transmission speed: 10/100/1000/2500Mbps. for Windows 10/Ubuntu 18.04 or higher version. Contain 1x RJ45 port, supports PCI for Express x1, x4, x8 or x16 socket. Low power consumption, low latency, stable transmission, not easy to cause packet loss or distortion. Aluminum-shaped heat sink can effectively reduce the chip temperature and avoid unstable data transmission due to overheating. Specifications: Material: Metal Size: Approx. 65.3x44.5 mm/2.57x1.75 in Transmission speed: 10/100/1000/2500Mbps Supports PCI for Express x1, x4, x8 or x16 socket RJ45 Port System Requirements: for Windows 10/Ubuntu 19.04 or higher Package Includes: 1x Network Card 1x User Manual 1x Low Profile Bracket note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.