Features: All aluminum heat sink and clear PC material fan material, high heat dissipation efficiency, safety and environmental protections, good heat resistance, and durability. Quiet cooling fan, oil bearing, smooth working,you don't have to worry about noise. Equipped with a heat sink, keep for Banana Pi R4 mainboard as cool as possible for high performances. The cooling fan runs smooth and quietly, which is beneficial for the heat dissipation of the development board. Can be installed through interfaces. Only for Banana Pi R4 Specifications: Product material: Aluminum For: for Banana Pi R4 Size: As PIctures Color：As PIctures Fan：Oil Bearing Fan Package Includes: 1PC Cooling Fan note: Please allow 0-1cm error due to manual measurement. please make sure you do not mind before bid. Due to the differences between different monitors, the picture may not reflect the actual color, thank you!