Description 4B Dual Fan 4B Heatsink Kit 4B GPIO Expansion Board for DC 5V 0.2A with LED for 4B / 3B + / 3B / 3A Product features: 1.Compaitable with 4B / 3B+ / 3B / 3A+ 2.for all versions of 3.Clear pindefinition bysilkscreen on PCB, GPIO function fully displayed. All GPIO pins are pulled out, So when the is being cooled, its development function will not be affected. 4.Thedualcooling fans are designed for active cooling mode, the heat can be discharged in for time. 5.LED and fan both have independentswitch, you can control the LED and fan separately,itwill not bring the dazzing feeling when you use it in the night. Package contents: 1xExpansionboard module with double Fans and LED 4xCopper column(column double pass M2.5*17mm) 8 x Screw( M2.5*5 countersunk screw) 1 x Screwdriver 1x plastic bottom base logo label 4x PCB Spacer