Spacious Chassis: This huge 4U server case comes with 15 internal 3.5’ HDD bays. Expandable & E-ATX Compatible: 7 PCI expansion slots and E-ATX compatibility gives you growth options for all of your needs. Exceptional Cooling: 8 pre-installed cooling fans provide excellent airflow and heat protection. 3 front 120mm fans, 3 middle 120mm fans and 2 rear 80mm fans ensure your drives and chassis avoid overheating. 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 and built-in front panel lock.