Add two eSATA ports to your desktop computer through a PCI Express expansion slot 2 Port PCIe eSATA Controller Card Adapter PCI Express eSATA Controller Card PCIe eSATA Card eSATA Controller SATA II Hard Drive Controller HDD Storage Controller SATA 300 Controller Includes a lowprofile halfheight bracket for installation in small formfactor computers Compliant with Serial ATA 2.5 specifications with transfer rates up to 3.0Gbps.