Sisun 2.5"/3.5" DUAL SATA HDD Docking Station +Card Reader Hub (876 with clone(red)) Hold maximum 2X2TB hard drive at the same time. HDD clone function-HDD clone without computer, not simple file copy Hot-Swap capability for rapid multi HDDs access & exchange One Touch Backup(OTB) function(need install software and need USB connection) Directly exchange data between 2 HDDs