This is a aluminum alloy case perfect for raspberry pi 4 model b ONLY, Passive cooling with housing heat dissipation design, with 3 built-in Heatsink Pillars to tightly touch with on-board raspberry pi chipset, No More Overheating Problem. wiki for reference: raspberrypiwiki.com/index.php/Armor_Case_B All ports and slots of the case can match with Raspberry Pi 4 Model B perfectly, GPIO port, USB ports , Ethernet interface, USB-C Power port, Camera Interface, Display Interface, SD card slot are access to use. Open case design, you don't need to worry it will effect wifi signal any more Packing List: 1 x Aluminum Alloy Case, 1 x Screws Pack, 1 x Wrench(No including raspberry pi 4 model B board) If you need better heat disspation, we recommend you could replace the 3 pieces silicon cooling pad to copper heatsink(the thickness can be about 0.5mm), then add the silicone grease (Shin-Etsu Shin-tsu X-23-7921-5 is recommend as our test).