Notice : not choose wrong type hdd , this link have 3 types goods ,if you not sure contact with us 6616C3(Single-bay) & 6626C3(Dual-bay) & 6626C3-C (2 bay Clone) Product Description 2.5/3.5-inch SATA Hard Drive Docking Station Container Design High Quality Aluminum Alloy 6616C3 VS 6626C3 ( 6626C3-C With Offline Clone ) Sigle-bay VS Dual-bay Support 20TB Max VS Support 40TB Max 12V2APower Adapter VS 12V3A Power Adapter 10Gbps transfer rate Spring cover dust-proof design >Offline Clone Function Tips : this link have 3 type, if you need clone, choose with offline clone function hdd case >High Reading Efficiency The dock supports reading multiple bays simultaneously >Upgraded Speed Support USB3.2 Gen2 protocol, UASP protocol, and TRIM function, with transmiion speed reaching up to 550MB/s >High Heat Diipation Efficiency The open design and metal body provide a better heat diipation effect >Strong Power, Stable Connection Notice: Single-bay Power Adapter is 12V 2A Dual-bay Power Adapter is 12V 3A >The 10-minutes auto sleep mode effectively extends the hard drives lifespan and avoids data lo and corruption Notice : if you need closed auto sleep mode,in opeartion maybe will lost data,need copy all file to backup,so suggest not closed this funtion is best. >All SATA Hard Drive Compatible >The enclosed 2-in-1 multi USB cable meets your diversified demands and supports PD 60W output >It can be used to connect PCs, laptops, smart TVs, smart routers, PS4 and other devices Tips Offline Clone Instructions 1.Insert the disks in. Disconnecting the docking station with the computer. Turo off the power and insert disk A into the Source Slot and disk B into the Target Slot. 2.Connect the power. Switch the button at the back of the docking station to Clone and turn the power on. 3.Clone start. Pre the Start button at the back and the indicator light flashes when cloning. The indicator light is constantly on after the clone is finished. Notes: 1.The target drive must be equal to or larger in capacity than the source drive. 2.Please do not move the disk during proceing, and do not connect the dock with the computer. 3.The target disk needs to activate by connecting to the computer. Steps: PC Management Disk Management Online 4.The offline clone speed is 500G/2hrs.