Advantech 4U Rackmount / Tower Chassis for EATX/ATX/MicroATX Motherboard - Tower/Rack-mountable - 4U - 13 x Bay - 3 x 4.72" x Fan(s) Installed - 2 x 1800 W - Power Supply Installed - EATX, ATX, Micro ATX Motherboard Supported - 44.09 lb - 5 x Fan(s) Supported - 3 x External 5.25" Bay - 2 x Internal 2.5" Bay - 8 x External 2.5"/3.5" Bay(s) - 10x Slot(s) - 2 x USB(s):