Features:100% brand new and high qualitySupports simultaneous reading of two SATA hard disks, tool-free disassembly and assembly of hard disks, and hot-swappable support.High-speed USB2.0 data transfer rate up to 480MB/sec.USB1.1/USB2.0 SATA I and SATA II are compatible.Support all 2.5'' / 3.5'' SATA hard disks (maximum support 2TB);The transfer speed of e-SATA interface can reach 3GB/sOne-key backup function (only on the USB port) with LED indicator .The offline clone speed can reach 70MB/sSupport system (Window98/Me/2000/XP/Vista/7/Mac operating system 9.X/10.x/Linux). Package Includes:1 x HDD Base Enclosure Specifications:Item: Dual Bay SSD Dock BaseDC:12VMaterial:ABSSize:approx 13x10x7cm/5.11x3.93x2.75inApplicable: IDE/SATA Output interface:/USB2.0 SATA I and SATA II CompatibleCapacity:Support 2TBSupport:All 2.5 '' / 3.5 '' SATA; USB1.1Plug Type: EU/UK/US Plug (Optional) The Basic OperationConnect to the hard disk dock and computer with a USB cable. Open my computer, you can see the drive letter, and the red signal indicator light is on when reading the drive.Press the one-key backup button to perform one-key backup. You can use the external e-SATA interface to connect with the computer e-SATA interface to transfer data.When offline cloning, insert SATA hard disks in both A and B positions (A is the main disk, and A is less than or equal to B), turn on the power switch, and confirm that the hard disk is spinning. Then double-click the single-key backup button twice, and the time interval between the two clicks does not exceed 5 seconds. If the red indicator light flashes, it means that the clone is normal. (Note: The USB interface cannot be connected to the computer during offline cloning) note:For the safety of your hard disk data, you'd better not to plug or unplug the hard disk when it is connected to the power source.The e-SATA interface is plug and play and supports hot swap.Please allow 0-1cm error due to the manual measurment and certain tolerances in the product, please understand.