1Using original JMB585 main control chip, highspeed and stable transmission, strong reliability. 2LED indicator monitoring. The blue LED indicator is gentle and not harm to your eyes. 3The blue light is always on when the power is on and the disk is read, and the blue light flashes when reading, and the working status of the hard disk is monitored at any time. 4Goldplated design, scratchresistant and wearresistant, more stable transmission, compatible with PCIE X4, PCIE X8, PCIE X16. 5Support multiple systems for OS X/ Windows7/8/10, plugandplay without drive. Item Type:Expansion Card Built-In Interface: PCI-E 4X Output Interface: 5 x SATA3.0 Support Hard Disk: SATA interface hard disk Support System: For OS X/ Windows7/8/10 Installation Method: In-Line PCI-E card slot Size: Approx. 12 x 8cm / 4.7 x 3.1in 1 x Expansion Card 5 x SATA Connect Cable 1 x Bracket