Components Specification Dimensions(mm) 437.5mm x 650mm x 44mm, standard 19" rackmount chassis. Materials 1.0mm SGCC Zinc-Coated Steel. Backplane 6Gb/s SATA backplane, / 6Gb/s MINI SAS backplane,with temperature control chipset. / 12Gb/s MINI SAS backplane, with temperature control chipset. Drivers bay 4 x 3.5" hot-swap SATA (II or III) / SAS (II or III) 6Gb/s drive bays. CD-ROM bays 1 slim CD-ROM bay(Compatible with 2.5" HDD/SSD). Cooling Fan Optional 6pcs 40mm fan position, standard quotation with 4pcs 4028 AVC ball bearing fans. PSU form factor 1U standard power suppy, length180-250mm. M/B form factor Support MAX 12" x 13" motherboard. Epansion space 1 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 Srorage,security monitoring,cloud computing,LOTetc. Product Features: 1.Conformed with EMC design standard to prevent from electromagnetic interference. 2.Support motherboard size up to 12" x 13",and 4*3.5"HDD bays,1 slim CD-ROM ,1U standard power suppy, length180-250mm. 3.The chassis has good ventilation system 4pcs 4028 AVC ball bearing fans to make sure the system work steadily.