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 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. Package includes: 1 x PCI-E X16 to for M.2 adapter card