Features 1、APPLICABLE MODEL: The cooling fan and blocks are suitable for Raspberry Pi 4B CPU heat dissipation in electronics enclosure. 2、HIGH EFFICIENCY: Combination of oil contained fan and aluminum alloy cooling blocks, with high efficiency and practicality. 3、STABLE OPERATION: The cooling fan kit has low noise and large air volume, which can ensure the smooth operation of the system. 4、ROTATION SPEED: The rated voltage is 3V or 5V, and the rotation speed can be up to 1600r/min or 6000r/min. 5、COMPACT SIZE: The fan is small in size and light in weight, which is easy to use and does not take up space for installation. Specification Item Type: Heat Dissipation Fan Material: ABS, aluminum alloy Purpose: Suitable for most built in shells for Raspberry Pi CPU heat dissipation Appearance: Square Fan Blades: 9 blades Structure: Oil containing miniature bearing Speed: 5V-6000r/min; 3V-1600r/min Air Volume: 1.2CFM Current: 0.05/0.1A Power: 0.3W/0.5W Interface: 2P branch cable Package List 1 x Fan 3 x Cooling Blocks