MAIN OVERVIEW FEATURES: Motherboard Supported: µATX,ATX,SSI CEB,SSI EEBNumber of Fans Supported: 3Number of Fans Installed: 1Number of External 5.25" Bays: 3Number of External 3.5" Bays: 3Number of Internal 3.5" Bays: 4Number of Total Expansion Bays: 10Number of Total Expansion Slots: 7Total Number of USB Ports: 2Number of Power Supplies Supported: 1Compatible Rack Unit: 4UForm Factor: Rack-mountableHeight: 6.9"Width: 16.9"Depth: 21.5"Package Contents: RM41300 Rackmount Enclosure1 x Add-on Card Retainer1 x 4U Chassis Base1 x PS2,ATX bracket1 x Door Front Bezel