Roomy Chassis: This 2U server case has 4 internal 3.5’ HDD bays plus 2 additional 2.5’ devices. Expandable & Micro-ATX Compatible: 4 PCI expansion slots and Micro-ATX compatibility gives you options for expansion. Quiet Cooling: 2 pre-installed 80mm front cooling fans plus room for 1 additional 80mm fan provide excellent airflow and heat protection at reduced noise. Desired Features: Front panel LED indicators for power, HDD, and LAN status monitoring allow quick, easy visual assessment. Additional utility with 1 USB 3.0 and 1 USB 2.0 port.