Dshot&reg; Aluminum alloy 5.25'' Inch Bay Tray Less Mobile Rack with Aluminum door for 3.5'' Inch and 2.5'' Inch SATA III HDD with Extra 2 Port USB 3.0 Accommodates both 2.5" and 3.5" Hard Drives Unique anti-shock DesignBuilt-in USB 3.0 19-pin Header Cable (24") File transfer speeds up to 6Gbps when paired with SATA III HDD and controller HDD Power Switch (Controls Both HDD) Aluminum alloy case and door