1、The U.2 interface is not USB0. It is also called SFF-8639, which is an interface specification released by the SSD Form Factor Work Group. 2、U.2 can not only support SATA-Express specifications, but also compatible with SAS, SATA and other specifications. Therefore, it is a four-channel version of the SATA-Express interface, and its theoretical bandwidth has reached 32Gbps, which is no different from the M.2 interface. 3、The original name of the M.2 interface is the NGFF interface. It is a new generation interface standard tailored for Ultrabook. It is mainly used to replace the mSATA interface and has the characteristics of small size and mainstream performance. 4、The M.2 interface can support PCI-E channel and SATA at the same time. The former is easier to increase the speed. The theoretical bandwidth is 10Gbps. It also breaks the theoretical transmission bottleneck of the SATA interface. 5、With PCB material, this adapter has quality assurance without worrying quality problems. 1 x Screwdriver1 x Adapter2 x Screw2 x Connecting Column1 x User Manual Item Type: NGFF M.2 Key M SSD to SFF-8639 AdapterMaterial: PCBColour: Black