Key Features 8x 3.5"/2.5" SAS/SATA Backplane for Hot-Swappable Drives Front HDD Door Lock & Side Panel Intrusion Switch Front I/O Ports: 2x USB 3.0 3x Middle 8cm (5000 rpm) PWM Fans & 2x 8cm (5000 rpm) PWM Fans 4U / Full Tower Chassis Supports max. Motherboard, Sizes E-ATX 13.68" x 13" ATX/Micro ATX 920W Redundant Platinum Level Certified High-Efficiency Class-B Power Supply 3x 5.25" External HDD Drive Bays & 8x 3.5"/2.5" Hot-Swappable HDD Drives