Components Specification Dimensions(mm) 437.5mm x 650mm x 88mm, standard 19" rackmount chassis. Materials 1.0mm SGCC Zinc-Coated Steel. Backplane 6Gb/s SATA backplanet, / 6Gb/s MINI SAS backplane, with temperature control chipset. / 12Gb/s MINI SAS backplane, with temperature control chipset. / 6Gb/s Expander backplane, with temperature control chipset. / 12Gb/s Expander backplane, with temperature control chipset. Drivers bay 12 x 3.5" hot-swap SATA (II or III) / SAS (II or III) 6Gb/s drive bays. Cooling Fan Optional 4pcs 8CM fan position, standard quotation with 3pcs 8038 ball bearing fans. PSU form factor 2U standard power suppy or redundant power supply. M/B form factor Support MAX 12" x 13" motherboard. Epansion space 7 full-height PCI/PCIE expansion slots. Connector Two front accessible USB2.0 ports(Optional USB3.0). System Control Power LED*1 Reset*1 Power SW*1 HDD LED*1 NIC LED*2 UID LED*1 UID SW*1 OH/FAN Fail LED*1 Power Fail LED*1. Applicarion Cloud storage, cloud computing, big data, security monitoring, LOTetc. Product Features: 1.Conformed with EMC design standard to prevent from electromagnetic interference. 2.Support motherboard size up to 12" x 13", and 12*3.5"HDD bays, 2U standard power suppy or redundant power supply. 3.The chassis has good ventilation system 3pcs 8038 ball bearing fans to make sure the system work steadily.