Supports up to 4 x 2.5' SATA/SAS HDD/SSD into a single 5.25' bay Support SATA 6Gbps or SAS single channel (requires SAS host) Accommodates 2.5' drives with 7mm, 9mm &12.5mm Height Removable ExpressTray system for tool-less, easy installation comparable to tray-less designs Fan speed control for HIGH, LOW, and AUTO (smart cooling) settings Metal case with heavy duty ABS tray and door latch