RMC4S ▶ Specification ▣ Construction  Heavy-duty cold-rolled steel  ▣ Drive Bays  3 x 5.25" + 1 x 3.5" exposed bays + 2 x 3.5" internal HDD  ▣ Cooling system  2 x 90mm ball-bearing fans + 1 x 80mm ball-bearing fan  ▣ Power Supply  300W ~ 460W ATX/EPS PFC power supplies  ▣ Back Plane  14 x full-height expansion slots  ▣ Speaker  0.4W built-in  ▣ System Boards  Full size SBC motherboard  ▣ Controls  Power on/off and system reset and dual USB ports ▣ Humidity  5% - 95% non-condensing  ▣ Dimension  482 mm (W) x 508 mm (D) x 177 mm (H) : 19"(W) x 20"(D) x 7"(H)  ▣ Operation Temperature  0ºC(32F)~50ºC(122F)