The WD 4TB My Passport for Mac USB 3.0 External Hard Drive is a compact, portable drive designed to work right out of the box with Mac systems running macOS 10.13 and later. It comes with both USB Type-A and USB Type-C cables, so it's compatible with both current and older systems. As a bus-powered drive, no external power sources are required. For protection, it has built-in 256-bit AES encryption and password protection. Users can also download the WD Discovery and WD Drive Utilities software to help manage their data and drive.