Style: Black with Fan Packing: Carton Packaging Quantity: 1 Product Name: Aluminum Alloy Dual Fan Shell Accessory Type: Shell Product Color: Black Product Applicable: Raspberry Pi 4th Generation b Type Product Size: 8.5*5.5*2.5 cm Product Material: Fine Aluminum Alloy Product Attributes: Ultra-thin design, easy to install, built-in thermal conductive column, fast heat dissipation, all ports and slots are fully accessible, reinforced aluminum material, lightweight and durable, open design ensures no interference with Wi-Fi signal Features: 1. Efficient heat dissipation: Dual fans help transfer heat from the Raspberry Pi CPU to the aluminum alloy shell via the thermal conductive column, enhancing overall cooling performance. 2. Good heat dissipation performance: Built-in thermal conductive column and compatibility with cooling fans improve heat dissipation efficiency. 3. No interference with Wi-Fi/Bluetooth: The slotted design of the aluminum alloy shell ensures uninterrupted transmission of Wi-Fi and Bluetooth signals.