The OWC Mercury Elite Pro ( UNIT ONLY ) is a high-quality external drive that is compatible with laptops, PCs, and Macs. It features a 3.5-inch form factor and a sleek silver design. The drive supports external SSDs and HDDs, and has a USB 3.0 specification for fast data transfer.The Mercury Elite Pro also has a FireWire 800 and eSATA interface, as well as a USB and FireWire 400 interface. It comes with a USB port and indication light, making it easy to use and monitor your data transfer. This product is perfect for those who need extra storage space and want a reliable solution.