Structure Size(mm):275*170*355 Case Size(mm):305*170*355 Packing Size(mm):330*200*385 Material:0.35mm SGCC(Inside structure)+ABS Plastic Motherboard: :ITX/M-ATX Drive bay:      DVD rom 5.25" x1                          HDD  3.5"   x2                         SSD  2.5"    x3    PCI:4 Fan support:front:120mm*1                            side:120mm*1                            rear:80mm*1   Max CPU upper height:155MM Max GPU length:265MM I/O: Embedded front panel, No need        screws         Switch on/off*1        Reset *1        USB Port:4 (2 USB1.1+ 2 Standby)        Audio input*1 & output*1        Type C Charge port*1        Card reader port *1         Structure Size      275*170*355mm Case Size(mm) 305*170*355mm Packing Size(mm) 330*200*385mm Material 0.35mm SGCC/SPCC Motherboard ITX/M-ATX Drive bay DVD rom 5.25" x1  HDD  3.5"   x2 SSD 2.5"    x3 PCI 4 Fan support: front:120mm*1/ side:120mm*1/80mm*1   Max CPU upper height:155MM Max GPU length 265MM USB Port 2 USB1.1+ 2 Standby Audio input/output yes  Type C Charge port Support  Card reader port Support