1Wide Compatibility: This PCIe 4x to u.2 SFF8639 expansion card is compatible with ordinary SATA hard disk. 2For 2.5in SSD: This PCIe 4x to u.2 SFF8639 expansion card is used for 2.5in SSD or mechanical hard disk. It has PCIE, SATA, SAS signal. 3High Speed: This PCIe 4x to u.2 SFF8639 expansion card adopts SpeedPlus.Link high speed signal reinforced technology for stable and faster transmission. 4Low Delay: The U.2 interface supports NMe standard protocol, low delay and low power consumption. 5Note: The mainboard that does not support NVMe cannot serve as a system disk but only as a storage disk. Item Type: U.2 to Pcie Adapter Material: Printed circuit board Interface: PCI-E 4X Power Port: SATA 3.0 Hard Disk: 2.5in SSD Supported System: Suitable for Win 7, for Win 8, for Win 10, for OS X, for Linux. 1 xU.2 to Pcie Adapter 1 x SATA Cable 4 x Screws