UCtech USB 3.0 to SATA Hard Drive Duplicator Dock for Dual 2.5"/3.5" HDD/SSD - SATA 6Gbps w/ UASP - Offline Clone Function Available for two 2.5" or 3.5" form factor SATA hard drives (HDD) and solid state drives (SSD), max. up to 2 x 4TB totally. Easy to install, without tools and screws, no additional driver required. UASP (USB Attached SCSI Protocol) support ensures to achieve a best performance for your SATA III SSD/HDD (6Gbps) when used with a UASP-enabled host. Equipped with super speed USB3.0 interface up to 5Gbps, backward compatible with USB2.0/1.1 connections. Plug and play, hot swappable. Standalone 1:1 Sector by Sector HDD Duplication (no computer needed); progress LED indicators display the duplicating status. In package: 1x SATA Dual Duplicator Dock, 1x USB 3.0 Cable, 1x Power Adapter, 1x Instruction Manual