ITEM NAME:For Raspberry Pi 4B Protect Box CNC Aluminum Alloy Case Enclosure Cooling ab Hn.All ports and slots of the case can match with Raspberry Pi 4 Computer Model B perfectly. 1 x Armor case for raspberry pi 4 model B(Case with dual fan). We use silicon cooling pad (the thickness is only 0.5mm) to touch the shell body to dissipate heat.