Item Type: For Raspberry Pi 4 B+ Case_x000D_ Material: Aluminum alloy_x000D_ Color: Red_x000D_ Type: Shell_x000D_ Compatible: For Raspberry Pi 4th generation b+_x000D_ Features: Passive cooling architecture designs can achieve perfect heat dissipation1Adopt aluminum alloy material after oxidation sand blasting treatment, smooth and not convex, possess high hardness, pressure resistance, strong metallic luster, not easy to rust, more conducive to heat dissipation 2All ports and slots of the case can perfectly match for Raspberry Pi 4 Computer Model B 3The external slot of the aluminum alloy shell will not affect the transmission of wifi/for bluetooth signals 4Built‑in heat column, shell can be equipped with cooling fan(without fan), heat dissipation is more effective 5Using a silicon thermal pad (only 0.5mm thick) to touch the housing for cooling. You can use CPU grease to loosen the silicon gasket for better heat dissipationFor Raspberry Pi board is not included.1 x For Raspberry Pi 4 B+ Case(without fan)1 x Screw Pack