Thunderbolt 3 NVMe M Key M .2 SSD chassis, supports PCI-Ex4, and the theoretical transmission speed can reach up to 40Gb/s (MAX). Test data (Samsung 970 Evo 250G): Thinkpad T470 (x2) read: 1400+ MB/s, write: 1500+ MB/s; MAP 2018 (x4) read: 2700+ MB/s, write: 1500+ MB/s. Not all Thunderbolt 3 computers are x4 full speed, some of them may be x2 Only compatible with 2280 and 2260 M.2 NVMe SSDs. Incompatible M.2 SATA SSD, M.2 PCIe AHCI SSD or other M.2 non-nvme devices are not supported Enhanced heat dissipation design, integrated heat sink, provides optimal ventilation for NVMe SSD running at high speed Ideal for professional content creators who need to stream and edit high-resolution content, gamers who need high-performance external libraries, or administrators who want to run virtual machines at performance levels not possible before Thunderbolt 3 Comes with Thunderbolt 3 protocol-specific high-speed transmission Type C Gen3 data cable (Intel certified), about 50cm in length, with installation tools, and a protective pouch Specification: Model: UTE02 Built-in interface: M.2M-Key Support hard disk: PCI-E protocol M.2 NVMe solid-state hard disk (does not support PCI-E AHCI and SATA protocol hard disk) Input interface: Thunderbolt 3 interface Transmission rate: 40Gbps Support capacity: 2TB Cable length: 50cm Weight: 135g Size: 115mm*42mm*15mm Support system: Windows/for Mac Note: This product only supports computers with Thunderbolt 3 interface.