Mfr Part Number: P183 V3 Case Type: ATX Mid Tower Material: 0.8mm cold rolled steel for the durability; 1.0mm cold rolled steel around 4x HDD area M/B Type: Mini-ITX, microATX and Standard ATX Drive Bays: 13 External Bay: 4x 5.25"; 1x 3.5" Internal Bay: 6x 3.5"; 2x 2.5" for SSDs Expansion Slots: 7 Cooling System: 1x 120mm TriCool Rear Fan 1x 120mm TriCool Top Fan Side Windows: No Front I/O Panel: 2x USB 2.0 ports; 1x USB 3.0 port; Audio In and Out (HDA and AC97 compatible) Power Supply: None Dimensions (WxDxH): 8.1 x 19.9 x 20.25 inch / 205.0 x 507.0 x 514.0 mm Weight: 31.0 lbs / 14.0 kg RoHS Compliant