Utilizes the original JMB585 main control chip for high-speed, stable, and reliable transmission. LED Indicator Monitoring: Gentle blue LED indicator for eye comfort. The light is always on when power is on and the disk is being read, and flashes during reading to monitor hard drive status. Gold-Plated Design: Scratch-resistant and wear-resistant with stable transmission. Compatible with PCI-E X4, PCI-E X8, and PCI-E X16 slots. Multi-System Support: Works with OS X/Windows7/8/10, plug-and-play without drivers. Item Type: Expansion Card Interface: PCI-E 4X Output Interface: 5 x SATA3.0 Hard Drive Support: SATA interface hard drives Supported Systems: OS X/Windows7/8/10 Installation Method: In-line PCI-E slot Dimensions: Approx. 12 x 8 cm / 4.7 x 3.1 inches Package Includes: 1 x Expansion Card, 5 x SATA Connect Cable, 1 x Bracket Customer Priority: Your satisfaction is paramount. Contact us immediately if you find any issues like damage or incorrect quantity for the best after-sales service.