External Interface: USB3.0; Internal Interface: SATA; Supports 3.5"SATA HDD UP TO 3TB(9.5mm); High-speed Transfer rate up to 5Gbp; Write-protect switch; OTB(one touch backup function); Indicator: Power & Data accessing indicators; Magnesium alloy shells, sand blasting oxidation process, laser carving LOGO; External power supply, low consumption, more stable power supply