[Widely Application]: Compatible with all versions of raspberry pie footnotes, raspberry pin pins can be used, the board is suitable for 4B / 3B+ / 3B / 3A+ [Outstanding Design]: Clear pin mark, GPIO function fully displayed. All GPIO pins are lead out, so when the Raspberry-Pi board is being cooled, its development function will not be affected. [Perfect Cooling Performance]: The cooling fan adopts active cooling mode, the heat can be discharged in time. Besides, it included dual fan, the effect of cooling and ventilation is better. [2 Control Switches]: LED and fan both have switch,you can control the LED and fan individually, it will not bring the dazzing feeling when you use it in the night. Clear pin mark, GPIO function fully displayed. All GPIO pins are pulled out, So when the is being cooled, its development function will not be affected. Nominal voltage: DC 5V Current: 0.2A Compaitable with 4B / 3B+ / 3B / 3A+ Function: The of these heat sinks are perfectly adapted to the 4B standard. Colour: as shown Material: Aluminum Size: 6.5 x 5.6 x 0.9cm Package Contents: 1 x Expansion Board with double Fan Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.