Advantech ACP-4340 Server Case - Rack-mountable - 4U - 6 x Bay - 2 x 4.72" , 3.15" x Fan(s) Installed - 1 x 500 W - Power Supply Installed - ATX, Micro ATX Motherboard Supported - 2 x Fan(s) Supported - 1 x External 5.25" Bay - 0 x Internal 5.25" Bay - 0 x External 3.5" Bay - 0 x Internal 3.5" Bay - 0 x External 2.5" Bay - 1 x Internal 2.5" Bay - 4 x External 2.5"/3.5" Bay(s) - 15x Slot(s) - 2 x USB(s)