Components Specification Dimensions(mm) 250mm(D) Ã?430mm(W) Ã? 45mm(H) Materials 1.0mm SGCC Zinc-Coated Steel,Aluminium HDD bay 1 x 3.5" HDD or 2*2.5" HDD/SSD bays Cooling Fan 2pcs 4020 fans PSU form factor Standard 1U powersupplu M/B form factor Support Mini-ITX Mainboard USB port:Two USB ports in front Epansion slot: One PCI/PCIE horizontal expansion slot System Control:Power switch,Reset switch,Power LED ,HDD LED Application:Router,Firewall, behavior managemeng,vieo decode etc Product Features: 1.Super 1.0mm/SGCC refined, stable structure, exquisite craft, Conformed with EMC design standard to prevent from electromagnetic interference . 2.Support mini-M/B,standard 1U power supply,2.5"/3.5" HDD/SSD. 3.The chassis has a good ventilation systen with hidden vent design in front panel and two 4020 fans to make sure the system work steadily. 4.Front panel and hanger are made of Brushed Anodized Aluninium materrial.