This is an external USB to 2.5" SATA Hard Drive HDD cable with Protective Case/box, it will allow you to combined a 2.5" SATA HDD or SSD to be an external Hard drive. The Dual USB designed will provide you high-speed data transfer rates and 5V power stable power source from the USB connector. No extra power required, Support hot-swap, plug and play.Furthermore, you can also use the protective Case Separately --use the USB to 2.5" SATA HDD cable to connect the 2.5" SATA HDD upto the computer, while the box to store or carry another 2.5" SATA HDD SDD conveniently.Clever design, connect the 2.5"" SATA HDD to your computer into external enclosure. Support USB2.0 with transmission speed up to 480MB/sec, and also compatible with USB 1.0, USB Y cable supports 7200rpm HDD or more.