The Dynex 2 Port e-SATA II PCI Express Adapter is a high-quality interface card designed for expanding the number of ports available for SATA II devices in your computer system. With two external eSATA and SATA II ports, this adapter allows for seamless connectivity to a variety of external storage devices. Compatible with PCI Express ports, this adapter is easy to install and is an ideal choice for improving the performance and functionality of your computer system.