Easily add 2 more SATA ports to your system for additional drives or combine them into a RAID array. Utilize either two internal SATA port, 2 external eSATA ports, or 1 of each. Simple and quick to use in a vertical orientation for quick connecting. Allows for a single port to be used for port multiplication. Includes an LED cable for detecting HDD activity. OS SUPPORTED: Windows 7, 8, 10