FIDECO NVMe SATA dock adopts USB 3.2 Gen 2 standard and can support UASP, and the maximum speed can reach 20Gbps in theory. FIDECO NVMe SSD cloner dock can support offline clone with 20Gbps lightning speed to save much time for you for data backup. Just insert 2 SSDs into respective slots, connect the power adapter (do not connect computer), and long press clone button for 5 seconds until 25% light is flashing blue.Before offline clone, do ensure the target SSD capacity is equal to or larger than the source SSD capacity by checking both disks in Windows "Disk Management". If 4 blue lights are flashing, it means the clone failed.For data transfer or offline clone, M.2 NVMe SSD and SATA SSD cannot be inserted simultaneously, otherwise only SSD A can be recognized, and SSD B cannot be recognized.FIDECO NVMe SATA SSD Docking Station can support M.2 PCIe NVMe SSD with M-Key or M+B Key and M.2 SATA SSD with M+B Key. The supported M.2 SSD sizes are 2230/2242/2260/2280/22110. Just one dual M.2 cloner dock can meet your needs of using different sizes of SSDs.