Case Size Mini Tower Case Color Black/Silver External Drive Bays 5.25inch x 2 3.5inch x 2 Internal Drive Bays 3.5inch x 1 2.5inch x 1 Front Ports USB 2.0 x 2 Audio MB Form Factor Micro-ATX I/O Expansion Slot PCI-E Expansion Slot x 4 Power Supply ATX 12V Form Factor Thermal Solutions Intel Certified TAC 2.0 120mm Rear Fan Safety Meets RoHS CE and FCC Class B Requirements Security Padlock Loop / Kensington Lock Optional 90mm Front Fan IEEE 1394 Side Panel Clips Chassis Intrusion Switch Tool-Free Drive Bays USB 3.0 x 2 3.5 to 2.5 HDD/SSD Bracket Item Dimension (L"xW"xH") 13.8 x 7.5 x 15