This is a high-performance external SSD case that supports up to 4 M.2 SSDs and 40Gbps. The item for sale is a **"new, unopened" item** as shown in images 1 and 2. ※Images 3-5 are reference images showing the operation of a different unit. Please note that these are not the items for sale. Specifications/Features: Compatible Drives: NVMe M.2 SSD (up to 4) Maximum Speed: 40Gbps Heat Dissipation: High heat dissipation performance with an aluminum enclosure, equipped with a cooling fan Tool-less Design: Easy to attach and detach (M.2 SSDs are secured with screws) ⚠ Important Notes: If the USB port or cable is less than 40Gbps (e.g., USB 3.1 Gen1 or Gen2), the transfer speed will be limited. With M.2 Gen3 SSDs, you can generally achieve **maximum performance (around ~3,500MB/s)**. Please note that with M.2 Gen4 SSDs, speeds of 5,000-7,400MB/s will not be achieved due to specifications.