S Series – 4mm Tempered Glass – Materials: SPCC – Expansion Slots: 4 – Accessible Drive Bays: 2x 3.5″ or 2x 2.5″ (HDD Rack) – Hidden Drive Bays: 2x 2.5″ (HDD Bracket) – Motherboard Support: Up to Micro-ATX (9.6″ x 9.6″) – I/O: 1x USB 3.0, 2x USB 2.0 & HD Audio – Fan Support: 2x 120mm/140mm Front, 2x 120mm/140mm or 1x 200mm & 1x 120mm Rear Fan