Features: brand new and high quality Hollow out design, better heat dissipation, stable operation for a long for time, and can work under a wide temperature PCI-E interface is for the motherboard of X4 / X8 / x16 card slot High speed fast creation is faster and more stable. Equipped with pcie3.0 X4 interface gen3 speed, you can give full for play to the speed of U.2 hard disk, so that you can enjoy the speed of reading and writing transmission and experience 4000mb/s Thick gold-plated electric shocks are in close contact with the motherboard interface, reducing hard disk usage failures, run smoothly No driver required for window series MacOS, Linux series Specifications: Product name: U.2 to PCI-E X4 Riser Color: Red Product size: approx. 133x78x120mm/5.24x3.07x4.72in Bus Type: PCI-E 3.0 X4 Support system: Windows8/10/Linux/for Mac OS Package Includes: 1 x U.2 to PCI-E 3.0 X4 Adapter Card note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement.