Feature: 1. Dual M.2 slot design: NGFF to SATA3.0 dual M.2 hard disk transfer box has dual M.2 slot design, which Can Insert two M.2 NGFF SSD hard disks at the same time, but can only read one hard disk at a time.(Note: 2 hard disks cannot be read at the same time) 2. High-speed data transmission: The adapter box supports the SATA3.0 interface to achieve a data transmission rate of up to 6Gbps. It is easy to read or write large amounts of data, back up files, or play HD videos. 3. Portable design: The compact and design also makes it easy to carry, meeting the needs of users in different occasions. 4. Wide compatibility: the hard disk adapter box supports M.2 NGFF SSD hard disks of specifications (30mm / 42mm / 60mm/80mm). 5. Simple installation: users can easily plug, unplug and assemble products without pressure, and the adapter box does not need drivers, plug and play, and is simple and easy to use. Specification: Support interface: M.2 NGFF (sata protocol) interface External transfer interface: SATA3.0 Transfer speed: 6Gbps Product Description: Can insert 2 hard drives at the same time,But only one page can be read at a time. NGFF2 starts working after the switch moves upward. NGFF1 starts working after the switch is flipped down. Note that the switch position must be consistent with the hard drive you want to read. For example, if you want to read ngff1 and you turn the switch to ngff2, you will definitely not be to read it!! Support hard disk: M.2 SATA Protocol SSD (That is NGFF) Warm Notice: Does not support the use of m.2 hard drives with nvme pci-e protocol! Material: PCB + Plastic colour: black Package Contents: 1 x M.2 to SATA 3.0 Adapter Card 1 x Case 1 x Pack of Screws Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.