Round cooling holes on both side of the case, provides good heat dissipation;Reserved Side Slot(Interface) for GPIO/FFC CableHigh quality metal material with surface galvanized process;Compatible with P165-A/P165-B heatsink;Compatible with Low-profile CPU Cooler ICE Tower Cooler;Size:185 x 120 x 120mmNote:Not include Raspberry Pi4 & X880 V1.1 , X880-A1 A2 board & 2.5/3.5inch SSD/HDD & Power supply.The WiFi or Bluetooth signal will be affected if use the metal case, we advice that you use ethernet network or 5.8G wifi AP to replace the 2.4G wifi to test.Colour:blackMaterial:MetalPackage Contents:1 x X880-C1 Metal CaseOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.