Component :Specification Dimension(mm):420mm(D) Ã?430mm(W) Ã? 45mm(H) Material:1.0mm SGCC Zinc-Coated Steel,Aluminium HDD bay:2 x 3.5" HDD bays or 4*2.5" HDD/SSD bays Cooling Fan:4pcs 4020 fans PSU form factor:Standard 1U power supply M/B form factor :Support motherboard size up to 12"*9.6" USB port:Two USB ports in front Expansion slot: One full height PCI/PCIE profile horizontal System Control:Power switch,Reset switch,Power LED ,HDD LED Application:Security monitoring ,cloud computing ,LOT etc Product Features: 1.Conformed with EMC design standard to prevent from electromagnetic interference . 2.Support motherboard size up to 12"*9.6",and 1U power supply,2*3.5"HDD or 4*2.5" HDD/SSD. 3.The chassis has a good ventilation systen with hidden vent design in front panel and four 4020 fans to make sure the system work steadily. 4.Front panel and hanger are made of Brushed Anodized Aluminium material.