Built-in Cooling Fan:Rapid heat dissipation through vents on both ends of the SSD enclosure,Avoiding high heat generation and affecting transmission speeds.Note:You don't need to install thermal grease on your SSD to avoid affecting the air duct ventilation Up to 4TB Expansion:We recommend that you use an M key/B&M key NVMe SSD of up to 4TB.This is an SSD enclosure only and does not include any NVMe SSDs. Tool-free Installation:No need to remove and install screws, use the card pin to complete the installation, easy to operate. The built-in cooling fan also eliminates the need to install thermal grease yourself WISH TAG:USB 4.0 40Gbps M.2 NVMe SSD Enclosure,40Gbps M.2 NVMe SSD Enclosure,For Thunderbolt 4/3 SSD Enclosure,SB 3.2 ASM2464 External Hard Drive Case,for PC Product Model:M280U4C Maximum capacity expansion: M.2 single drive supports 8TB MAX Transmission speed 40Gbps Output interface Type-C to Type-C Product interface USB 4 Type-C Support hard disk M.2 2280/2260/2242/2230 Supported systems: for Windows, Mac OS, Linux, and Android Support interface fully compatible with for Thunderbolt 4/ for Thunderbolt 3 Type-c backward compatible with USB3.2/3.1/3.0/2.0 (The product printed words may vary depending on the batch, but this does not affect use) Color: Black Material: ABS Package Contents: 1 x 40Gbps M.2 NVMe SSD Enclosure 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.