About this item, you need to know. We add a Built-in Cooling Fan and heat dissipation holes to the aluminum alloy shell to acheive better heat dissapation. No screws or screwdriver needed, plug and play. 2 enclosure supports M KEY and B&M KEY SSD with size 2280. Speed test with Samsung 980 on Macbook Pro, the Read / Write speed of ACASIS 40Gbps NVME enclosure reaches up to 2805MB/s / 2734MB/s(Different speeds may vary from different system). The compact design makes TBU405PROM1 easy to be carried in a handbag or pocket, nice for travel & business trips. This USB 4.0 M. 2 NVMe Enclosure supports M1 Pro/Max Mac devices and iPad Pro. Compatible with Windows, macOS and Linux. Compatible with USB 4.0/3.2/ 3.1/ 3.0/ 2.0 at respective speed limits to meet a variety of work and daily needs. Thunderbolt 4 Data Cable1. SSD Fixing Rubber Stopper1. Cover the lid directly, ball-type closing installation method. Plug and play, no need to wait. Active cooling fan + aluminum alloy shell + grid hollow design + thermal conductive silicone pad, four layers of long-lasting heat dissipation to ensure data security. 2 NVMe PCIE enclosure TBU405PROM1 supports M KEY and B&M KEY SSD with size 2280. Maximum theoretical transmission rate up to 40Gbps. Transfer speeds vary depending on the different interfaces.