Trayless 3x 5.25" to 4x 3.5" 12Gb/s HDD Hot-swap Rack Aluminum Frame, designed for heavy-duty purpose Supports SAS I/II/III and SATA I/II/III Hard Drives Integrative shaping aluminum design for quickest heat sink High Performance Transfer Rate up to 12Gb/s Aluminum front bezel with metal key lock mechanism for double safety Removable fan cover for easy maintenance Multi-functional LED Indication Support Hot-Swap & RAID Configuration (need an additional RAID controller) 14TB Hard Drives Compatible Product Introduction BPN-DE340HD 12Gb/s tray-less hot-swap hard drive cage. It features the latest transfer rate technology of 12Gb/s and is RAID capable. It also comes with adjustable fans speed and ultra-quiet cooling fans. The LED Display lights features the new blue light by popular demand. Heat dissipation is enhanced by the full aluminum construction and a 80mm fan. SATA power connector increases compatibility with most power supplies. The metal key locks help secure your hard drives and prevent unauthorized access. Converting three standard 5.25" drive bays into four usable hard drive slots, it is economically designed to maximize your investment.