Features: brand new and high quality Four-bay SSD Front and rear PCI-E X16 to for M.2 NVME for matrix card. High speed solid state drive acceleration expansion card, 2 front and rear sides, smaller size. Indicator status: for always on when power on, flashing when reading and writing. Support system: for Windows / for Mac / Linux. The NVME for M.2 four-port interface can be expanded at the same for time, and the transmission speed can reach 10000MB. Specifications: Product Name: PCI-E to for M.2 Quad-Disk Adapter Card Transmission speed: ≥ 10000MB Card slot interface: X16 Material: environmental for protection metal + fiberglass baffle Support hard disk: for M for key hard disk Color: black Size: 170x53x10mm/6.69x2.09x0.39in Package Includes: 1 x PCI-E X16 to for M.2 adapter card note: There may be a little size error in manual measurement. Due to different lighting effects and monitor settings, the color of the actual item may not exactly reflect the color in the images.