Supports 4x PCIe NVMe U.2/U.3 SSD up to 15mm drive height Installs into any standard external 5.25'' optical drive bay Uses 4x OCuLink (SFF-8612) to connect pin-out defined by SFF-9402 Rev 1.1 Supports PCIe 4.0 specification with transfer rates up to 64Gb/s per drive bay Supports Tri-mode controllers PCIe/NVMe pinout (Broadcom Areca and more) Ruggedized full-metal enclosure meeting flammability requirements Removable tray system for easy maintenance Dual high-performance 40x20mm cooling fan with three fan speed setting (High Low Off) Industry-leading 5 years limited warranty against all defects Complimentary support from professionally trained technical support agents