Ugreen 60355 M.2 B-key Hard Drive Enclosure, USB Interface USB C 3.1 Gen 2, Included Cable USB-A to USB-C, Transfer Speed 6Gbps, Max Capacity Supported 2TB. UGREEN External M.2 SSD Enclosure is meant to connect a SATA NGFF based M.2 SSD to a computer for more stable and quicker data exchange. It easily turns a M.2 SSD into a portable external hard drive that helps to reuse your old M.2 SSD.