Style: Black with Fan x 3C Digital x 4B x 5vPacking: Carton PackagingQuantity: 1Product Name: Aluminum Alloy Dual Fan ShellAccessory Type: ShellProduct Color: BlackProduct Applicable: Raspberry Pi 4th Generation b TypeProduct Size: 8.5x5.5x2.5 (cm)Product Material: Fine Aluminum AlloyProduct Attributes: Ultra-thin design, easy to install, built-in thermal conductive column, fast heat dissipation, all ports and slots of the shell are suitable for Raspberry Pi 4th Generation b Type, reinforced aluminum material, lightweight and durable, open design can ensure that our shell will not affect the wifi signal.Features: 1 Efficient heat dissipation: With dual fans, the heat of the Raspberry Pi CPU is transferred to the aluminum alloy shell through the thermal conductive column, and the dual fans further enhance the heat dissipation effect of the aluminum alloy itself.2 Good heat dissipation performance: built-in thermal conductive column, the shell can be equipped with a cooling fan, and the built-in thermal conductive column makes the heat dissipation more effective.3. No influence on WIFI or Bluetooth: It does not affect the WIFI signal. The outer surface of the aluminum alloy shell is slotted, which does not affect the transmission of wifi or bluetooth signals.