Roomy Chassis: This 2U server case has 4 internal 3.5’ HDD bays. Expandable & Micro-ATX Compatible: 4 PCI expansion slots and Micro-ATX compatibility gives you options for expansion. Quiet Cooling: 3 pre-installed 80mm front cooling fans provide excellent airflow and heat protection at reduced noise. Desired Features: Front panel LED indicators for power and HDD status monitoring allow quick, easy visual assessment. Additional utility with 1 USB 3.0 and 1 USB 2.0 port.