Welcome to our store! 1. Features the original JMB585 main control chip for high-speed, stable transmission and strong reliability. 2. Equipped with a gentle blue LED indicator that's easy on the eyes. 3. The blue light remains on when powered and reading the disk, and flashes during read/write operations, monitoring the hard drive's status in real-time. 4. Gold-plated design is scratch-resistant, wear-resistant, and provides more stable transmission; compatible with PCI-E X4, PCI-E X8, and PCI-E X16. 5. Supports multiple operating systems including OS X, Windows 7/8/10, and is plug-and-play with no driver required. Item Type: Expansion Card Built-in Interface: PCI-E 4X Output Interface: 5 x SATA3.0 Hard Drive Support: SATA interface hard drive Supported Systems: For OS X/ Windows7/8/10 Installation Method: In-Line PCI-E slot Size: Approx. 12 x 8cm / 4.7 x 3.1in Includes: 1 x Expansion Card 5 x SATA Connection Cable 1 x Bracket Customer satisfaction is our top priority. If you encounter any issues with your product upon receipt, such as damage or incorrect quantity, please contact us immediately. We are committed to providing you with the best possible customer service.