Features: Brand new and high quality Transmission: PCIe 4.0 x16 is supported, which provides fast data transmission and meet the requirements. 4 disk design: support four 4-disk NVMe disk, greatly expanding the storage capacity and performances. NVMe compatibility: specially for NVMe disk, which fully releases the writing performances of disk and improves the overall efficiency of system. Hot plugging support: It have hot plugging function, which is convenient for users to replace and add hard disks without shutting down system. Stability: made from electronic components, providing stable and reliable performances and ensuring data transmission safety. Specifications: Material:PCB Package Includes: 1x Expansion Card note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.