Norco 4U Rack Mount Server Chassis - Black RPC-470 4U rackmount design,meets EIARS-310C standard ,3 x 5.25" drive bays, 11 x 3.5 " drive bays Easy drive mounting with 24 screwless rails Support EEB (12"x13"), CEB(12"x10.5"), ATX (12"x9.6"), Micro ATX (9.6" x 9.6") motherboard ,4x80mm middle fans,2x120mm optional front fans fans, 2x80mm optional rear fans for better ventilation Switch:Power ON/OFF x 1, System reset x 1 ,Indicator:Power ON/OFF x 1, HDD x 1, NETWORK X 2,Connector:One front accessible USB port Power Supply Options:Standard ATX, mini redundant power supply ,Dimensions ( W x D x H ):19" x 25.5" x 7" (483mm x 650mm x 176mm) Packing:Double boxes Weight:15.5 kg/34 lb (NET) 17 kg/37.5 lb (GROSS)