Welcome to the store! 1、Ultra-thin design, light and durable, open slotted design, can ensure that our shell does not affect wifi Bluetooth signal transmission. 2、Built-in heat-conducting column, fast heat dissipation, cooling fan can be installed, all ports and slots on the shell are suitable for Raspberry Pi 4 Model B. 3、Easy to produce a dense and firm protective film on the surface, which protects the substrate from corrosion, has strong wear resistance and is not easy to rust. 4、For Raspberry Pi CPU heat is transferred to the aluminum alloy housing through the heat-conducting column, and the dual fans further enhance the heat dissipation effect. 5、Oxidation sandblasting process, high hardness, strong pressure resistance, metallic luster, aluminum alloy material is more conducive to heat dissipation. Item Type: Aluminum Alloy Case Set Material: Aluminum Alloy Purpose: Radiator Housing Accessories Adaptation PCB: For Raspberry Pi 4 Model B Shell size: Approx. 8.5x2.5x5.5mm / 0.3x0.1x0.2in 2 x Metal Housing Accessories 1 x Sticker 4 x Screw 1 x Hex Wrench Your 100% satisfaction is our top priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will give you the best solution!