High speed signal enhancement technology, SFF-8639 U.2 Transmission Protocol. Support NVME SSD & SATA NGFF SSD Two groups of 5A high-power DC to DC power supply modules. High elasticity connector, strong connection, durability, stability and earthquake resistance, and hardware protection. Note: Two disks can work at the same time, but U2 X16 expansion card must be selected. B: m.2 NGFF of SATA protocol; Usually there are two space (supported by this product). M key: m.2 NVME of pcie protocol; Usually a space (supported by this product). M.2 disks can be used only if they have NVME or SATA label on them. Specifications: Name: M.2 to U.2 expansion card. PCI-E3.0 X4 GEN3 Transmission speed: U2 SFF-86 type: without shell colour: black Material: PCB Size: 96x65mm Package Contents: 3 x adapter plate 3 x screwdriver (random colors, don't accept the specified color) 3 pack x Screws