Western Digital My Passport Essential 500GB USB Hard Drive - Blue, with grab-and-go USB Dock and WD Soft Carrying Case Contents - My Passport Essential 500GB Portable USB Hard Drive, grab and go USB dock, WD soft carrying case. 500GB Hard Drive Capacity. Automatic, continuous backup. Password protection and 256-bit encryption. USB 2.0 interface,Powered by the USB bus. No separate power supply is needed .