Component:Specification Dimension(mm):650mm(D) Ã?428mm(W) Ã? 45mm(H) Material:1.0mm SGCC Zinc-Coated Steel,Aluminium HDD bay:4 x 3.5" HDD bays Cooling Fan:5pcs 40mm fan position,standard chassis with 3pcs 4028 fans PSU form factor:Standard 1U power supplu M/B form factor :Support motherboard size up to 12"*13" 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"*13",and 1U power supply,4*3.5"HDD or 8*2.5" HDD/SSD. 3.Front panel is made of brushed anodized alumnium,with hidden vent design,and three 4028 ball bearing fans to make sure the system work steadily. 4.Color:Front panel is brushed anodized black color,the rest part of chassis is steel color. 5.Widely used is storage,cloud computing,cloud rendering and NVR etc.