SPECIAL FEATURE Smart HDD modular system Enormous 250mm fan (front) Enormous 250mm fan (side) Twin 18cm fans (top) VR fan speed control (front & side & top) 1.0mm SECC/100% ABS plastic parts Excellent cooling solution Tool-less clips & rails for easy installation 10PCS HDD trays with 10PCS HDD coolers USB 2.0 and E-SATA