Features: brand new and high quality 2.5G M2 RJ45 for Express Gigabit Ethernet card is a high-performance 10/100/1000M network card. Adopt brand new original 2.5G network card chip, with low power consumption, low latency, more stable transmission, and not easy to cause data packet loss and distortion. The PCIe to 2.5G network adapter supports data transfer rates up to 2.5 Gbps. Combined with the new 2.5GBase-T technology, it is 2.5 times faster than a typical gigabit adapter. The 2.5G network adapter supports three speeds: 2.5Gbps, 1Gbps and 100Mbps. It fits most PCI for Express x1, x4, x8 or x16 slots, with short iron pieces, and can be used in large and small cases. This 2.5G network adapter for Windows 10, Ubuntu 19.04 or later operating systems. Specifications: Material:Metal Transmission Rate: 10/100/1000Mbps Bus Type: M2 (KEY-M/B) Applicable Network Type: Gigabit Ethernet Port type: RJ-45 Rj45 Connection: Use Cat5e, Cat6 Or Cat6a Compatible With Cables Up To 100 Meters Long Operating Temperature: 0 c To 55 c (32 f To 131 f) Storage Temperature: -40 c To 70 c (-40 f To 158 f) Maximum Storage Humidity: 90% Non-condensing Relative Humidity 35 c System Requirements: for Windows 10 Ubuntu 18.04 or Higher Size: As the Picture Shows Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 x for M.2 B+M for Key 2.5G Network Card 1 x RJ45 Network Connector Card Daughter Board 1 x 10-pin Network Cable 1 x 4-pin LED Cable 1 x User Manual