300W High-efficiency Power Supply ,2x 5.25" external drive bays, 4x 3.5" internal drive bays, 1x 3.5" external drive bay (OEM) ,Rear 9cm PWM Cooling Fan with tool-less design ,1x 8cm Front exhaust Fan (optional) ,4x I/O expansion slots ,2x USB ports (2.0 ready) ,Power switch and 3 LED indicators ,Quick installation: tool-less side panels, Drive Bays, HDD Cage turns 90, and Stamped Motherboard Support (no standoffs required) ,Kensington Lock Security. This m-ATX chassis will work with the following Supermicro m-ATX MB and its compatible with all m-ATX MB in the market now. (78469,67074,57530,67077,69971,62565,70589,62570,62572,58685)