Akitio Nt2-U3.1 Configurable hardware RAID controller (Non-RAID, RAID 0, RAID 1, SPAN) SuperSpeed USB 10Gbps (USB 3.1 Gen 2) interface Backwards compatible with USB 3.0 and USB 2.0 Extremely compact dual-bay design for two 3.5" drives Security lock slot & Quiet cooling fan with ON/OFF switch