1. Supports PCIe 4.0 X4 compatibility with for Gen3/Gen4 2. The R73B design adopts a DCDC high current module to stable operating voltage under load conditions 3. R37B is equipped with an additional protective circuit to the safety of SSD use 4. All aluminum alloy shell, CNC high-precision process, sturdy and portable, fast heat dissipation and conduction 5. PCIe Gen4 connector LDP 1683-15B38-9H, made of LCP flame-retardant high-temperature plastic steel material, plated with 30u thick gold High speed, low resistance, high temperature, and oxygen PCB board Product Name: M.2 (M-key) NVMe to U.2 (SFF-8639) Hard Disk Box Speed and bandwidth: PCIe 5.0 x4 128Gbps (does not support protocol) Working temperature:- 40-80 Flame retardant grade: 94V0 The SSD hard drive in the picture is not included Color: Black Material: PCB+Aluminum Alloy Package Contents: 1 x M.2 NVMe to U.2 SSD SFF8639 Adapter 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.